Here's a good one:
Platypus Laguz
Ridiculous luck, good SPD.
Decent SKL, RES, MAG (for some reason)
Terrible HP, STR, DEF.
Mastery Skill: Something Venom related (For reasons unknown to absolutely everyone, Platypusseses have incredibly powerful venom), perhaps 2x Damage and a very powerful poison effect (reduce movement/HP cap/both temporarily?)
Movement is not reduced by water (when transformed, when untransformed it is slightly reduced).
Weakness: No Idea. Perhpas Crocodile Laguz?