I know a bunch of punching bag characters that crossed my mind:
Lurky(Rainbow Brite) - The dumb hairball henchman is mostly Murky's abuse object,hahahahaha

.
Daffy Duck/Porky Pig/Elmer Fudd/Yosemate Sam/Taz Tasmanian Devil/Rocky & Muggsy/Papa Bear & Baby Bear/Big Bad Wolf/Sylvester/Wile E. Coyote/Claude Cat/Dodsworth(Looney Tunes) - Those poor guys are major abuse objects & that Tweety is the biggest jerk ever

.
Tom(Tom & Jerry) - The poor cat always gets abused by the little rat Jerry & the mangy mutt Spike.
Brainy Smurf/Clumsy Smurf(The Smurfs) - He may be an annoying know-it-all,but he's always the punching bag as much as I feel sorry for him since he's my favorite character along with poor Clumsy Smurf.
Homer Simpson/Lisa Simpson/Marge Simpson/Scratchy/Mo/Lenny & Carl/Barney/Milhouse Van Houten/Principal Skinner/Sideshow Bob/Hans Moleman/Lance Murdock/Prof.Frink/Kirk Van Houten(The Simpsons) - It's hilarious when they get bashed so much,hahahahaha

.
Baby Gonzo/Baby Animal/Baby Fozzy/Baby Beaker(Muppet Babies) - He's so funny/weird but the poor guy is always that jerk Piggy's punching bag which is hilarious & the rest of the other Muppet Babies I feel sorry for too(except for Baby Fozzy)

.
Jabberjaw(Jabberjaw) - The funny dumb shark hero who's always treated badly by that loudmouth witch Shell,which I want him to devour her someday

.
The 3 pigs(The Raccoons) - Those poor 3 pigs are Cyril's abuse objects,hahahaha

.
Bobby(Bobby's World) - I feel sorry for his bashings by his evil rotten jerkoff siblings that are scum in that stupid show!!!!!
Iago(Aladdin) - The poor greedy parrot has the "Meg Griffin" syndrome when Aladdin & the gang are jerkwads treating him like dirt

.
Ren Hoek/Stimpy/Indifferent Ren Hoek(his indifferent half)(Ren & Stimpy) - Their bashings are so hilarious,gosh,I love that show

.
Taz Tasmanian Devil/Bullgator & Axle/Francis(Taz-Mania) - Poor Taz gets abused/beaten up in every episode,along with his arch enemies,Bullgator & Axle and Francis,so hilarious.
Eek! the Cat(Eek! the Cat)- The poor cat mostly gets abused when trouble comes at him especially Sharky the Sharkdog which it's funny.
Fluffy & Uranus(Duckman) - Those cute stuffed teddybears always get tortured/killed by Duckman which it's so hilarious.
Waspinator(Beast Wars) - My favorite villain who's always the punching bag especially when he's brocken in pieces

,poor guy.
Ace Ventura(Animated Ace Ventura

et Detective) - The wacky pet detective gets abused by animals like boxing kangeroos & Big Daddy the big alligator,hahahahahaha

.
Raticus(Flying Rhino Junior High) - The dumb rat is Earl/The Phantom's punching bag,hahahahaha.
Daggett(The Angry Beavers) - So hilarious when poor Daggett gets bashed alot & I love his screams as well

.
Oggy(Oggy & The Cockroaches) - The poor blue cat gets abused alot by the three jerk cockroaches,but he does get his victories a few times.
Johnny Bravo(Johnny Bravo) - The poor goofy girl-lover is always the girls' punching bag which those girls are such total jerks.
Steve(Larry & Steve) - The poor dog is always the punching bag while hanging around with a dumb idiot which is so funny.
Spongebob/Patrick/Squidward/Eugene Krabs/Sandy/Mrs.Puff/Plankton/Barnacle Boy(Spongebob Squarepants) - Their bashings are mega hilarious!!!!!!!
Peter Griffin/Brian Griffin/Lois Griffin/Chris Griffin/Cleveland/Quagmire/Joe/Kevin/Vaudeville Guys/Cleveland Jr./Mort Goldman/Peter's parrot/dumb beaver/James the cat(Family Guy) - Peter's bashings are always hilarious & poor Brian & Lois are mostly the punching bags at times by Stewie & the rest of the family which his bashings are hilarious,& the rest of the characters' bashings are hilarious

.
Ed/Edd/Eddy/Jimmy(Ed,Edd,& Eddy) - The dumb idiot character is usually abused by the brat Sarah besides the other kids & the poor smart character who's always the punching bag hanging out with those 2 losers & I wanna punch Kevin for bashing him

in any episode,& Eddy/Jimmy's well-deserved bashings are hilarious.
The Grim Reaper/Billy(Billy & Mandy) - The poor Grim Reaper does get abused by Billy & Mandy,but mostly Mandy who's the biggest jerk by always beating him down & Billy's abuse is hilarious.
Kyle/Kenny/Butters/Pip/Ned/Randy Marsh(South Park) - Kenny's many deaths are hilarious.Totally agree with Tobias,the poor cute innocent kid always bees treated badly,beaten, & humiliated as much I hated his crappy parents sometimes

& the ninjastar in the eye part made me stopped watching that ninjas episode as well,those stupid writers

,but Kyle's,Pip's,Ned's,& Randy's are so hilarious.
Timmy/Timmy's father/Vicky/Cosmo & Wanda/Jorgan/Denzel Crocker(Fairly Oddparents) - Their bashings are hilarious.
Invader ZIM/GIR/Dib(Invader ZIM) - Their bashings are funny.
Fry/Bender/Leela/Dr.Zoidberg/Amy/Capt.Zapp Brannigan/Kiff/Tiny Tim robot(Futurama) - Their many bashings are hilarious.
Snow Pea(Mucha Lucha!) - The cute little guy is mostly the punching bag by those three Hairy Knuckles bullies,so hilarious

.
Digit/Buzz & Delete(Cyberchase) - The poor cyberbird does get bashed mostly,the poor guy along with the Hacker's idiot henchmen,hehehe.
Thurgood/Sanchas(The PJ's) - Both of their abuse is always hilarious when karma comes a knocking

.
Dante Hicks(Clerks) - The poor guy is always abused,it's so hilarious

.
Master Shake/Frylock/Meatwad/Carl/Ol' Drippy/Ezekial(Aqua Teen Hunger Force) - They're mostly punching bags which it's hilarious.
Lucien Cramp(The Cramp Twins) - His many bashings from his evil jerkoff brother Wayne are hilarious while feeling sorry for him too.
Tommy(Robot Boy) - The poor boy is always abused by jerk brothers like Donny,selfish brats like Gus, & those three dumb bullies.
Capt.Gantu(Lilo & Stitch) - The poor alien is always the punching bag by his boss Dr.Hamsterval,Stitch,& other experiments which he's awesome,but never gets respect.
Stan Smith/Francine Smith/Steve Smith/Haley Smith/Klaus/Roger/Jackson/Barry(American Dad!) - All of their bashings are so hilarious,but poor Klaus/Barry.
Early/Rusty/Granny/Sheriff(Squidbillies) - Their bashings are always hilarious

.
Ben(Ben 10) - The poor boy is always treated like dirt by his annoying crappy cousin Gwen who's a giant jerkhole in the whole series.
Jude/Wyatt/Jen/The Clone Girls/Darth/Talon(6teen) - These characters are always abused alot,the poor guys,but it's hilarious

.
Hank & Dean Venture(Venture Bros.) - Their many deaths are always hilarious.
Doughy(Moral Orel) - Orel's poor innocent friend is usually the punching bag besides having crappy teenage parents like Butters,hahahahaha

.
Tom Dubois(The Boondocks) - That poor black guy who's a successful lawyer with a sexy wife gets abused alot,but it's hilarious

.
Otis/Peck/Mrs.Beady(Back at the Barnyard) - Their bashings are always hilarious.
Chowder/Mung/Truffles/Schnitzel/Gazpacho/Ceviche(Chowder) - Their bashings are hilarious,but the poor rock monster always gets abused while hanging around with Chowder which it's hilarious,the poor guy:radda:,hehehe.
Heather/Harold/Trent/Owen/Izzy(Total Drama Island/Action) - The poor cool campers' bashings are hilarious,but Heather's bashings are well-satisfying.
Ferb/Candace/Dr.Doofenshmirtz/Baljeet/Stacy(Phineas & Ferb) - Poor Ferb's abuse is funny.Candace's just desserts are always hilarious

.Funny mad scientist who always gets beaten up by a platypus which it's so funny,but I feel sorry for the poor guy which he has an interesting life/background unlike other mad scientists & has some funny moments,& Baljeet/Stacy's abuse is hilarious.
Jared(Superjail!) - The Warden's little big-headed assistant is always abused,so hilarious,the poor little guy

.
Coop(Kid vs. Kat) - The poor kid gets abused by a bad alien cat named Kat,but he gets a few wins which it's funny

.
Voltar/Doktor Frogg/The Henchbots:17 & 32(The League of Super Evil) - The 2 poor supervillains & 2 poor Henchbots of L.O.S.E. are always abused alot,but poor Doktor Frogg though which is so hilarious

.
Skipper/Private/Kowalski/Rico/Maurice/Mort/Marlene(The Penguins of Madagascar) - Their bashings are hilarious,but those poor guys,hehehe

.
Reef/Wipeout/Lo/Emma/Johnny(Stoked) - Their bashings are hilarious/sad.
Connor(Glenn Martin, DDS) - His bashings were so hilarious


.
Leonard(Lenny)(Fanboy & Chum-Chum) - That poor black junior manager is such a punching bag for Fanboy & Chum-Chum & it's hilarious,hehehe.
Yamcha/Master Roshi/Chi-Chi/Krillin/Tien & Chaotzu/Yajirobe/Piccolo/Gohan/Vegeta/The Namekians/Dende/Nail/Hercule/Videl/Supreme Kai & Kibito/Bee/The Supreme Kais/Good Fat Majin Buu(Db/Dbz) - The old hermit's bashing=hilarious.The poor guy has died many times which the writers can't give him a break:shrug:,& the rest of the characters' bashings was sad:crying:.
Ataru/Shinobu/Ataru's mother & father/Megane & the Stormtroopers/Jariten/Cherry/Rei/Shutaro Mendou/Kid Ataru/Ran/Onsenmark/Ryuunosuke & Mr.Fujinami/Kid Shutaro Mendou/Tobimaru Mizunokoji/Soban/The Spice Girls:Ginger,Pepper,& Sugar/alien centaur captain(Urusei Yatsura) - Hilarious for their many abuses.
Ash/Prof.Oak/Brock/Jesse,James,& Meowth/Butch & Kassidy/Rhonda/Chimchar(Pokemon/Chronicles) - Their many bashings are always hilarious,but poor Chimchar's is so sad from the jerkoff Paul:crying:.
Soun/Ranma/Genma/Tatewaki Kuno/Ryoga/Kodachi/Mousse/Happosai(Ranma 1/2) - The poor guy is always the punching bag by crazy violent witches,jerkrivals,& even Akane's dad which it's hilarious,but I feel sorry for him,but the the other characters' abuses are funny,hehehe.
Shinji/Rei(Neon Genesis Evangelion) - Their mostly punching bags from jerks like Toji/Asuka/Gendo.
Tenchi/Ayeka/Ryoko/Mihoshi/Kiyone(Tenchi Muyo!) - They're mostly punching bags on love triangles & partnerships,hahahahahaha

!!!!!!!
Karigari(My Dear Marie) - Poor scientist's beatings are funny though.
Yusaku Godai/Shun Mitaka(Maison Ikkoku) - The poor ronin loser mostly has bad luck when it comes to him especially annoying tenants,loser friends like Sakamoto,drinking problems,& handsome creep rivals like Shun Mitaka to get in the way

,& Shun's abuses from dogs/Kyoko are awesome.
Gourry/Xellos/Martina/Naga(Slayers) - They're mostly punching bags from Lina which it's hilarious.
Sky-Byte & the Predacons(Transformers:Robots In Disguise) - Their many bashings are mostly hilarious.
The Rubberobo Gang(Medabots) - Their bashings are mostly hilarious.
Mondo/Prince Eccentro/Batch(Mon Colle Knights) - Their bashings are always hilarious.
Seina(Tenchi Muyo! GXP) - The poor guy's bad luck always comes to him,except for fighting General DaRuma's space pirate forces,hehehe

.
King Muscle/Terryman/Ramenman/Robin Mask/Brocken Jr./Skullduggery & Slab/Sosumi/Prince Lou Ow/Warsman/Buffaloman(Kinnikuman) - Their bashings are hilarious,but sad on the death scenes.
Kid Muscle/Terry/Wally/Dik Dik/Kevin Mask/Jeager(Ultimate Muscle) - Their pummelings are funny/sad.
Inuyasha/Kagome/Shippo/Miroku/Sango(Inuyasha) - The jerk Inuyasha's well-deserved bashings are awesome,& Shippo/Miroku's bashings are hilarious.
Kenshin/Kaoru/Yahiko/Sanosuke/Megumi(Rurouni Kenshin) - Their abuses are hilarious.
Vash the Stampede/Rem/Meryl/Kaite/Nicholas D. Wolfwood(Trigun) - Their bashings are funny,but sad on Nicholas's death scene.
Yuji/Marlene/Joey/Robert/Keith/Rick/Alicia(Blue Gender) - Their bashings are totally sad/touching.
Keitaro/Naru/Motoko/Seta(Love Hina) - Their abuses are hilarious especially Naru/Motoko's well-needed bashings.
Jimmy/Conan(Detective Conan/Case Closed) - His bashings are hilarious.
Luffy/Usopp/Sanji/Brook(One Piece) - Their abuses by the other crewmembers are always so hilarious,but poor Usopp being a villains' punching bag.
Edward & Alphonse/Lust/Roy Mustang/Maes Hughes/Nina/Wrath(Fullmetal Alchemist) - Their bashings are sad/touching along with Edward/Wrath's well-needed bashings.
Chiyo/Sakaki/Tomo(Azumanga Daioh!) - The poor girls' bashings are LOL hilarious

.
Jelly Jiggler/Don Patch(Bo^7) - Their abuses are so hilarious by Bobobo

as much as I love/miss the show.
Naruto/Konohamaru/Rock Lee/Hinata(Naruto) - Their abuses are always hilarious by abusive jerks & rivals like Sakura,Sasuke,Ino,& Neji.
Utena/Wakaba/Anthy/Miki/Nanami/Keiko/Yatsuya/Ruka(Revolutionary Girl Utena) - Those girls/one handsome guy are mostly the punching bags by getting slapped alot,hahahaha

.
Renton/Holland/Matthieu/Moondoggie/Dominic(Eureka 7) - Man, the poor kid had it rough by always being the punching bag by abusive jerks like Holland/Talho,& Dominic's abuse from Anemone is so hilarious along with the others,hehehe

.
Ichigo/Orihime/Keigo/Rukia/Kon/Chad/Urahara/Ganju/Ririn,Kurodo,& Nova/Shinji/Hiyori/Nel,Pesche,& Dondochakka/Stark(Bleach) - Team Ichigo's abuse is funny/sad at times.Keigo's abuse is hilarious.Kon is mostly the punching bag for being the annoying pervert which it's hilarious,but I feel sorry for him when 2 jerks named Ririn & Jinta wanna abuse him

.Urahara/Shinji's abuse from Hiyori is funny,Ganju's abuse from Kukaku,& Stark's abuse from Lilinette is hilarious

.
Mesousa(Pani Poni Dash!) - The poor cute innocent white bunny is always the gag for abusement,it's so hilarious,the poor little guy

.
Kyon/Mikuru(The Melancholy of Haruhi Suzumiya) - Those poor people are such abuse objects for Haruhi,hahahahahaaha

!!!!!
The Alpha Gang:Ursula,Zander,& Ed(Dinosaur King) - Their bashings are always hilarious by their boss,Dr.Z

.
Dan/Marucho/Preyas(Bakugan:Battle Brawlers/New Vestroia) - Their abuses are funny.
Shuu/Jiro/Zola/Kluke/Bouquet/Maromaru(Blue Dragon) - Their bashings are epic & funny.
Lelouch/Marianne/Kallen/Diethard/Shirley/Suzaku/Earl Lloyd/Tamaki/Bartley/C.C./Sayoko/Cornelia/Princess Euphemia/Urabe/Rolo/Li Xingke(Code Geass:Lelouch of the Rebellion/R2) - Their abuses are epic,funny,& sad on the death scenes of Shirley,Bartley,Princess Euphemia,Urabe,& Rolo as well:crying:.
Simon/Kamina/Rossiu/Kittan/The twins:Jorgun & Balinbow/Nia(Tengen Toppa Gurren-Lagann) - Their abuses are funny,but sad on the death scenes of Kamina,Kittan,the twins:Jorgun & Balinbow,&
NIIIAAA:crying:,
WAAAAAHHH:crying:!!!!!
Setsuna/Patrick/Lockon/Tiera/Saji/Louise/Wang/Kinue/Christina/Lichtendahl/Ian/Joyce/Louise's mother/Lyle(Mobile Suit Gundam 00) - Their abuses are funny,but sad on the death scenes as well:crying:.
I mostly feel sorry for punching bag characters that get bullied by jerks,but their bashings can be hilarious.