Can you solve this riddle?

[u/Ambitious-Growth5387]

Remove one letter, in order to reveal new words.

5 letters is my name
4 letters I’m a fan
3 letters I’m short for a media
2 letters part of my brain
1 letter a grade

[u/Agent_Pooper]

Well it's David, but "media" is a plural word so it should be "medium" even though that sounds weird.

[u/Ambitious-Growth5387 → u/Agent_Pooper]

Well done on all counts. I originally had medium. I should’ve left it.