likes to tease people with the way "Serious" and how own name "Sirius" because it sounds alike. For example:
"you can't be serious!" "oh, yes, i am Sirius"
his animagus form is big black dog
has very bad marks and barely studies, prefers quidditch and pranks over everything
Snape studies in the same year at Slytherin and he has a bad relationship with marauders. They call him “Snivellus” and always pull pranks on him and other Slytherins