Mice would have a negative trait (consider how the long tongue increases oral pleasure, but Mice have buck teeth so...)
#BuckToothed (negative sexual trait) (could be a totally new trait in general and not race exclusive XD)
Mice would make wonderful scavengers, Increasing the chances of a unique/Enchanted equipment being found at the end of fight by 10%
#Scavenger (Positive Combat Trait)
Mice Are the real life equivalent of Goblins and their special breeding powers. Perhaps mice would be on equal terms on that field.
#Breeder (positive? Sexual Trait)
Imagine having a mouse in your party allows Instant escape, without having to wait your next turn (disclosing boss, or other battles where escape isnt an option)
#Escape Artists
hehe~ Were so awsome♪ ♥