I had to pull from really far back to get up to ten... Also, I cheated and put two for tenipuri. It's interesting to me how there are some series where I have a really clear favorite character, and others where I really don't have one at all, so some of my favorite series aren't on the list.
Kawamura Takashi (Prince of Tennis)
Fuji Yuuta (Prince of Tennis)
Genjyo Sanzo (Saiyuki)
Alphonse Elric (Fullmetal Alchemist)
Hitachiin twins (Ouran High School Host Club)
Watanuki Kimihiro (xxxHolic)
Draco Malfoy (Harry Potter)
Hiei (Yu Yu Hakusho)
Seguchi Tohma (Gravitation)
Shirogane Ryou (Tokyo Mew Mew)
About how I have no female favorite characters... DX I tried to pick one from Azumanga Daioh, but I love all of them too much to choose.