Books on Character theory and category theory

[mrandersdk]

As the title says i would like to get recommended some books on Character theory and category theory. I like my books to be really matematically and to not skip corners, but I don't like books that think that I'm a master mind and just write 'clear' or 'easy' instead of proving the theorem.

Anyone got some ideas ?

 

[matt grime]

Characters (of finite groups): Isaacs. (The term characters is very ambiguous.)
Categories: Mac Lane.

 

[mrandersdk]

Are there any reason that most books are on finite groups when i make a search on it?

I don't know much about characters, only seen them in my course on lie groups, but i guess they aren't on finite groups.