Sinbad has already appeared in Wizard101. He's not necessarily a tiger, but rather has the appearance of a Quat from Mirage. He has the appearance of a tabby cat. And yes, he does possess incredible bravado.
Well, that may explain it! A tabby has stripes like a tiger, my mom once had a cat that she called "Tigre" (Spanish for Tiger) he was an orange tabby.