for me personally i love Dr stein, he is just awesome full stop. Maka, for someone as young as her she has a lot of talent as a meister and a weapon. Soul- he just makes an incredible weapon. Death the Kid is pretty cool, and the fact that he is OCD about symmetry makes him hilarious! oh! i can't forget about Shinagami- sama as well as spirit, (Maka's father) he is ah... interesting very cringe worthy! haha! but a great dad to Maka and he too has his great moments!
For me it Spirit, Maka's father, he is pretty funny, then Death the Kid, his symmetry makes me laugh.. and Shinigami-sama forever.
Soul is definitely my favorite. I have a soft spot for Spirit and Dr. Stein.