1.Eren
I love the way he's written. He has passion, courage and deals with a lot of shit. His morals are the best in the series as well (just like Levis) Also he has the best scenes imo.
2.Armin
He's smart and talks RNS. He's realisticly written as well.
3.Levi
The same as Eren moral and passion wise just not as "loud".
4.Everyone else
5.Mikasa
I hate her for various reasons. She says that she's protecting Eren and yet he saved her ass more than the other way around. She is unrealisticly strong (breaking the handle of a knife and destroying the floor as a child) and this doesn't fit in (Levi is like that as well, but he can back it up with experience and training) I could honestly go further on. I just have a lot legit reasons to hate her.