I've always had a soft spot for Studio Pierrot and AIC. Both have a fairly distinctive style and are among the best in the world at crafting action scenes. Pierrot is responsible for most of the biggest hits in the Shonen Jump family...Yu Yu Hakusho, Hiraku no Go, BLEACH, the new Doreamon, Narutto: Shippuden...the original Magical Girl Creamy Mami, Fushugi Yugi, all of Saiyuki , Great Teacher Onizuka, Kimagume Orange Road, the first half Urusei Yatsura...
Hard to beat basically inventing the magical girl genre.
As for AIC, well, there's Tenchi, Blue Gender, Ah! My Goddes, Battle Athletes, Bubble Gum Crisis, (Now and Then, Here and There), El Hazard..heck, they even worked on Inspector Gadget. Especially in the old hand-drawn days you could always tell when it was an AIC project. The characters always looked like real people, even their hentai characters. Try finding anyone who does realistic hentai characters anymore.
Hard to beat basically inventing the magical girl genre.
As for AIC, well, there's Tenchi, Blue Gender, Ah! My Goddes, Battle Athletes, Bubble Gum Crisis, (Now and Then, Here and There), El Hazard..heck, they even worked on Inspector Gadget. Especially in the old hand-drawn days you could always tell when it was an AIC project. The characters always looked like real people, even their hentai characters. Try finding anyone who does realistic hentai characters anymore.