Planters
Peter Avinante goes by MrPeanut.
A university/college that uses the Rebel as the mascot is the University of Mississippi. The name of the sport team that uses Rebel as the mascot is the Ole Miss Rebels football team.
She is the mascot of the company.
OISK is a cosplay mascot brand, which is professional about making all Mascot customes.
Custom Characters in Glendale, CA
Super Mario is the official mascot of Nintendo.
The Academy uses the Navy ram as a mascot.
NBC
The tarsier
Mickey Mouse
9 Lives
According to this contributor's quick look around the internet, no major team has a pitbull as a mascot. Several sports team use a bulldog mascot, though.