why do some fans act like theyve monopolized a character or fandom?

I don't think I've seen that here unless you're talking about the 'true fan' nonsense. By this I mean; "oh you're not a real fan of *insert show* if you like *insert character*" To be honest I never got that.

Now if you're getting at something like, "I'm the biggest fan of this character!" I don't think that they mean any harm. If someone is super attached to a character I think it could feel like an accomplishment if everyone on the sites seems to know how much you love the character. The problem lies in them being like "this character is mine, mine, mine." I'll do this sometimes, but I'm just joking around.

I feel so called out :v

Nah but rly i don't consider myself as those type of ppl (at least i hope i'm not ._.), i don't own the or anything. I don't get bothered at all if someone else loves said character,, in fact i get happy. The more the better, ya know? ;v

Now as for why some fans act like they 'own' a character is probably b/c they love the character so much they feel no one else could like them / understand them as much as they do.. thus making things easier for them to get 'triggered' by the thought of having to share them w/ others. I mean.. i don't exactly blame them since i've kinda been through that phase before but if it resorts to aggressiveness to other fans who like the character then that's wrong & need to quit that =.=

Sometimes i may joke [random character] is mine but i'm rly not serious & won't go over board abt it

u wanna fite m8

But no, in all seriousness, if this is about me and my Mepphy obsession, I'm perfectly fine with people liking the character and the show. I just don't like people being attracted to him romantically because I'm in love with him (even though he's a fictional character. Pathetic, I get it) so it'd be like seeing some other derp flirting with my crush or some shit or hitting on my boyfriend so I immediately get defensive even though he's just a fictional character. Cuz all in all, I'm a very self-centered person. :v
At the same time I'm pretty caring, though. Like if you honestly opened up to me and actually talked to me I'd be friends with you. Instead of most other Mephisto fangirls that lash out after I get defensive and call me a retard or something when I claim Mephisto. One of my close friends is actually also a huge fangirl over Meph but I love her to fuckin death cuz she's so adorable and funny...

So, just saying from the end of one of those people that "monopolize" a character. I in no way own him but I'm madly in love with the character and would fight to the death for him. :T

*coughs awkwardly*