I'd honestly say Kesaran Pasaran has been one of my "secrets" to success since the game began. Many people who have played me, especially other Refess players, have commented on my unique early game techniques, and needless to say Kesaran Pasaran is included in them. In closed beta I had won a third copy and ran it in my deck as well however I've still yet to win a third copy again since the accounts were wiped and my deck has suffered for it. He's certainly not as strong as the Japanese Will-o-Wisp, but his combination of ranged attack, some what decent hp, and a fantastic SP generating ability allow him a lot of versatility in all stages of the game, early, middle, or even end.
And yes, knocking out Salamanders with them is one of their sweetest features.
The bunnies of Lavato have special abilities, like 'Action Skill: Make Carrot Disappear.'