Vanilla the Rabbit did not originate from fanon, and the information on this page may not be entirely accurate to their canon. You may read more about this subject in the context of their canon on the following wiki(s):
Vanilla the Rabbit is a character from the Sonic the Hedgehog series. She is an anthro, orange bunny, and the mother of Cream the Rabbit. She is strict with her daugther, but only because of how much she cares for her and wants her to succeed. Cream's sweet demeanor is all thanks to her upbringing.