Bibo

Bigger than Udon and Umeko but smaller than Sunflower. Bibo prefers he/him or they/them.
Bibo loves children and tends to befriend only children. When they no longer need him, he moves on.
Bibo will give kids rides on his back, play with them, enjoys tea parties. He enjoys comforting them.
Children in the most need of a friend are what calls him the most.