Okay here we go
in no particular order:
Dr. Facilier-from Disney's Princess and the Frog (Interesting and funny evil dude!)
John Stewart - from JL and JLU (gotta love how he grew and developed on the show!)
Penny Proud-from The Proud Family (She is such a nice/caring girl)
Aqualad/Kaldur'rahm-from YJ (keeps the team in balance, gets along with everybody! )
Suzie Carmichael- from Rugrats/Rugrats: All Grown Up (keeps peace between characters and protects the babies on the show!)
Maxine Gibson- from Batman Beyond (nobody mentioned her yet!)
Virgil Hawkins- from Static Shock ( cool to see African superhero with interesting powers have his own show ! )
Cyborg- from Teen Titans ( good guy who added to the fun mix that was TT!)
Numbah 5-from Kids Next Door (funny, supportive, and cute!)
Sunny Bridges-from Class of 3000 (whatever happened to that show !?)

(Best Music teacher to have! I wish my music teacher was more like him when I was a kid. )
There are other black characters that I enjoyed very much, however I can't think of their names right now. Do I need to list the reasons why I think these are great characters? Already did