Ratatosk

Ratatoskr is a squirrel who runs up and down the world tree Yggdrasil to carry messages between the eagle perched atop Yggdrasil, and the serpent Níðhöggr, who dwells beneath one of the three roots of the tree.

Personality
Befitting his alias as the Bitter Squirrel, Ratatoskr is a sarcastic, foul-mouthed and rude animal who will always take the opportunity to insult the party members whenever he is summoned. However despite this, he never tries to screw or insult the Vali Team over and seem to always take up his role as an ally of theirs willingly.