Was there ever a character with a personality different than what you expected? If so, who?

Akane Tsunemori from Psycho-Pass. By looking at pictures, and from a bit of the first episode I though she would be that one cute, naive, rather useless character you get in alot of action anime that I wouldn't think much of (seriously, look at those puppy dog eyes). But she developed very nicely, and I was pleasantly surprised by the end of the series.

Homura Akemi

I thought she would be shy and nice. She was a horrible person. Then she became an evil creature. I really don't like Homura.

Tina Sprout .

Do not be fooled by this cute face

She is extremely bad/ss

Rei(free!). Im pretty sure we all thought he would be the cool glasses type. We got a dorky dork mcdork. He's great. ^^

Mirei Minami.

Do NOT get fooled from this cutie.

She's part of the disciplinary committee.

Kyubey

I thought he/she/it has emotions but actually doesn't.XD

Hohenheim from fullmetal alchemist, i expected him to be cold and emotionless, then... he became one of my most favorite characters \(^w^)/

Masaomi kida ............