User blog:FlandreAndTakane333/Mario and Rosalina's new adoptive teenager

Other than Jeffy, Mario and Rosalina should have another adoptive child called Katie Ka-Boom, from Animaniacs. She always overreacts and turns into a monster, which scares Jeffy. Rosalina hates Katie Ka-Boom, while Mario likes her.

First episode idea featuring her

 * Mario's Adoptive Teenager!