Specimen (a):
The Science-Nerd. This annoying know-it-all is usually found in the school's science lab(s) and always has knowledge to share in the field of science. They can increase their height by pulling their pants up. Also can be librarian.

Specimen (b):
The Obnoxious-Nerd. Often a little brother, the Obnoxious-Nerd's favourite phrase is "Heyyy you guyyys, what's goin' on???!" They usually will show you their latest addition to their bogey collection, and their knees and glasses are virtually mummified in bandages. EXTREMELY goofy and can couse damage to one's sanity.

Specimen (c):
The Computer-Nerd. Due to the fact that the outside world is semi-existent to a Computer-Nerd, they are wearing "last century's fashion". As they speak, their hands are typing their words, subconsciously, on an hypothetical keyboard. Radioactive, due to prolonged exposure to computer screens, and hunchbacked.

Specimen (d):
The Bookworm-Nerd. 99.999 recurring times out of 100, the Bookworm-Nerd is a librarian. Cannot let go of a book until it is finished, and wear glasses with lenses thicker than they are wide.

*NB: Should any characters displayed or character likenesses resemble people either living or dead, it is probably purely coincidental.

Which one(s) are you? Which ones can you classify people that you know as?
I just used the pictures from this, even though the handwriting is infinitely more tidy than my handwriting today, just to arrange them better. It was drawn on a New Year's family camping trip, and I have a sneaking suspicion that it might be based on another scribbling in an old exercise book that I might have done but can't quite remember.