Preza is an experiment on how many fetishes they can cram into a single character design. She's actually an alright character, but she's like a bunny girl/furry/BDSM/Jessica Rabbit/sexy librarian amalgamation nightmare, and it just ruins the whole character for me.
Wingull was alright, but it's hard to get attached to a character who speaks in gibberish half the time, and evolves into a worthless gimmicky wall. I might be getting some signals crossed here. Probably my second favorite, but they tried a bit too hard to turn him into an already overdone 'brooding badass', and he falls a bit flat there.
Koitsu wa mirai wo takusu eigo no tsurugi da! ZANKUU TENSHOUKEN!!!!