Someone who collects keys is often referred to as a "key collector." This hobby can include collecting various types of keys, such as antique, decorative, or functional keys. Additionally, the term "key enthusiast" may also be used to describe individuals who have a passion for keys and their history.
A key enthusiast is one way to identify them. There is no actual term to refer to someone who collects keys out of enjoyment, but if they keep the keys out of fear that they may find a use for them after throwing them away, they are potentially a compulsive hoarder.
onithbfdbvb
A catapultist.
I would call him a hobbyist.
A button collector??
dumb
normally .you call one .a letterologist.
You would call them a locksmith. Locksmiths make keys for everyday use.
a hoarder x)
Graphologist comes to mind or autograph hunter.
Someone with too much time on their hands and too much space?
A key maker. -.-