I can't say I really hate anyone in the series. But if I had to rank them... It'd probably go like this.
S-Tier
Kanji
Yosuke
P4MC
A-Tier
P3 MC/FMC
Rise
Chie
Shinji
Aigis
Teddie
B-Tier
Mitsuru
Yukari
Akihiko
Koromaru
C-Tier
Junpei
Yukiko
Naoto
Fuuka
Ken
--
"I believe the proper phrase here is, 'You Fail'"-Miles Edgeworth
http://i.imgur.com/7dBe9.gif