Open character? What about.........all the characters!!!!!!!!!
All the unappreciated puppers
SPOILERKen & Minnie, Mel, 2 of Jeromes Pups, Tanishi, One of Gin's siblings, Teru, one of Kisaragi's kids, Kyoshiro's brothers, Jirou, Wolf pups, Chuck's son, Ichi, 2 of Hiro and Reika's kids, Hirota, Chibi, Seiji's son, the abdondoned pups GB found, and one of Mari's kids.
EDIT!!: I've had this one for a while and I've been saving it for a matching theme, so
From one of Yoshi's rare sketches