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
movie pirates
A button collector??
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).
vamp freaks
Lycanmaniac --------------------------------------------------------------------------------------------------------- Lycanophile??
Party pooper?
You !
skull collector
sociopath
Workohalic or social
an astro nut!
Someone who is obsessed with themselves is commonly referred to as narcissistic or self-absorbed.