Do you really have any champ that you have fun playing against?
For me, it only occurs when I'm beating the shit out of any champ, that either means that player fucked up or champ himself is weak.
I can't think of single one, I pick champ, enemy picks champ, I will think about what to do and what to avoid, fun factor is in that I want to get as fed as possible(that's why I hate braindead pushing midlaners Malza and Anivia) and carry or possibly show off my macro and win unwinnable game with it.
I think I could easily pick every single champ and tell you why they are unfun to play against, but I can't do it the other way around.
Can you please tell me which champs you find fun to play against?