You are a Human. Very much like Finn you also wear a hat to hide it. Few people know this. Your 1 year older then Finn.
Finn = (17)
Y/N = (18)
Though outfit won't usually be mentioned since you are a doctor the "Default" would be a Dark purple button shirt, white lab coat and jeans. Though as stated will hardly be mentioned.
Also for fun....who is Babe?
Princess BubbleGum
Flame Princess
Marceline
Huntress
( I was gonna put more, but my god I didn't realise how many Princess there were!)
[Authors Note]
I mention that your character also wears a hat to hide him being a human much like Finn, but the hat wouldn't be exactly like his. Again I won't point it out as much, but for the sake of having a "default" outfit let me offer the following hat
A hat that dosen't scream sus.