(Future) Trunks Briefs - Dragonball Z
I've always felt Trunks was the most complete character DBZ had. In a show where character development is sparse, Trunks did change from childhood to teen-hood. I always thought he was awesome. He had a sword and a lot of moments to himself.
Raimon Tarou - Eyeshield 21
What made me enjoy watching Monta was his struggles. He never, ever had an easy game. It was just hardship after hardship after hardship. But he never lost sight of what he wanted, no matter how many times he had his ass handed to him. Also, he provides the best jokes in the series.
Kittan Bachika - Gurren Lagann
Basically, he had all of the badassery Kamina had, but he was his own character. He's one of the best supporting characters I know of. He's one of the few, non-main character members of Team Dai-Gurren whose names I bothered remembering because he was just so likable. Also, episode 25. Just, episode 25.
L - Death Note
The best part of the series. Hands down. L was so bizarre that I couldn't help but feel attached to him. Out of every character on Death Note, he was the most interesting. L's name was a big deal, just because he's that interesting.
Kenshin Himura - Rurouni Kenshin
What made me think Kenshin was as great as he is was his backstory. One of the best ones I've ever seen to be honest. Not to mention his ideals and the way he fights is incredibly interesting. Also, the battousai.
Scar - Fullmetal Alchemist
Out of every character from FMA 03, Scar was the most believable and the most human. I never saw his struggles against the Government as anything less than perfectly believable. Also, he was awesome. Very awesome. He managed to decimate the main heroes in one of his first appearances.