My favorite Moga? Plain old Kittenstar doesn't do it for me, but I love the variations like the Northern Kittenstar. I even have a story: I remember when I was playing, and I was totally in need of Whistles (and had no friends at this point, plus I use up Bonus Attacks like crazy when I'm trying to raise my lower-level Tanks), and then I saw Skylar's Box down in the corner like usual. I wasn't making much progress in the game without Bonus Attacks, truthfully, and I was hoping Whistles would be one of the easier prizes to get. (I wouldn't know; this was shortly after Monster Galaxy started giving out free Moga Cash.) So I clicked on it, and I was actually pretty much in need of items in general, so I figured any of them would be okay. I ended up getting the North Kittenstar. This probably sounds stupid, but for a second I was kind of pissed, like, "Oh, how would a new Level 1 Moga help accomplish anything at this point, when all I need is to get into Windhym?" Then I realized, aside from being super-cute, that North Kittenstars are Legendary, and they have awesome stats, and so then I was grateful.
Whew. Long story, huh?