Someone who is obsessed with characters that aren't real may be referred to as a "fictophile." This term describes individuals who have a strong affection for fictional characters, often engaging deeply with their stories and personalities. Such individuals might immerse themselves in various forms of media, including books, movies, and Video Games, where these characters exist.
synesthete
Triathlete
A button collector??
movie pirates
You can call that person a "singer" or you can call that person a "vocalist."
meterologist
meterologist
It could be a chronophile (one who is obsessed about time).
an astro nut!
sociopath
skull collector
vamp freaks
Lycanmaniac --------------------------------------------------------------------------------------------------------- Lycanophile??
Party pooper?
You !
Workohalic or social
Someone who is obsessed with themselves is commonly referred to as narcissistic or self-absorbed.