My fursonas are all quite important to me, and have been pivotal to navigating my life in ways I find hard to articulate. The easiest I found to describe it is that they all have different 'functions', so their presence only comes up when they are relevant....basically they help me figure shit out.
For a lack of a better term, some also act as a mask to pick up to represent myself, when it's too scary or overwhelming to just be me.
"This sounds like-"Someone asked me if I had DID before and no I don't think so. I'm pretty sure it's some form of maladaptive daydreaming because I had a crappy childhood and needed to escape into the mind often just to get by. Now I don't need to cope that hard lol and this is the most present I've been, but living in my head and being around very talkative imaginary characters took up a huge part of my life, so it will show up.