Description (minor spoiler warning)

He’s a minor character. His major role and 1st debut/appearance was in the episode 5 “Babble, Babble”
He lives with an unnamed woman, his human owner. He was also seen looking sad and alone, it was later revealed that he was just hungry.
Mousse makes a cameo in episode 11 “Scary, scary.” He can be seen holding a wooden baseball bat.

Likes: helping out friends, helping Taruto, being safe, preparing for battle, being fed.

Dislikes: danger, no food, harm.

Fun fact(s):

-He resembles an older version of Nachos. I wonder if they have any relation? Is he the father of Nachos? Uncle? Grandfather/Grandpa? But it was left unanswered/unconfirmed. Unless they just dopplegangers?

-his name is pronounced as “Moose.” Thought it was a misspelling of “mouse.” So was thought to be pronounced as this but no. Kakipi informed this to Taruto. In episode 5 “Babble, babble.” By when he told her about Mousse’s name and more about him.

-he is quite observant and attentive.

-he made a a 2nd appearance + cameo at almost the end of the series. From the episode 11 “scary, scary.” Where he was seen holding a wooden baseball bat. With him wearing a white (what seems to be) sweat band. Looking like he was getting ready for battle. Behind Rakguan.