The reason Beloit has an unofficial mascot is because the campus is built around several Native American mounds. The largest of which is called Turtle Mound. The students, faculty and staff take great pride in the mounds and during campus visits the mounds play a prominent attraction showing the beauty of the campus. As a result of this pride the Turtle has become the unofficial mascot of the college.
The unofficial mascot is Gunga the Gorilla.
A rooster
The Hogettes
Goat
The Jets do not have an official mascot, but they do have an unofficial mascot named Fireman Ed. Click on the 'Fireman Ed' link on this page to see a video of him in action at a recent Jets home game. The unofficial mascot is Fireman Ed
The Juilliard School does not have an official mascot, but the school's unofficial mascot is the penguin.
Jack Nicholson lol
Stanford Tree (unofficial)
Crazy Ray
Tux is the unofficial but widely known mascot for the Linux kernel.
I think you mean Santa Clara University. The mascot is the Bronco and the colors are red and white. (The person who said Banana Slugs was mistaken - that is the mascot for UC Santa Cruz, a different school entirely)
Then your college doesn't have a mascot. Simple