Above all else, I find Springtrap sad. She's obviously confused and not very intelligent and feels trapped. She sees characters in games and YouTube personalities and wishes she could be like that. For most people, this feeling goes away after they've dressed up as them and gone to Comic-Con for a day or two, gotten it out of their system.
Spring however, also hates herself somewhat, so whilst most people take off the cosplay and go "Okay, that was fun, back to my work and my real life!". Spring doesn't to do that or draw the line, if she's not a psychopath who has power over others or a charming personality who people laugh with and enjoy, what is she? She's just a meat packer who enjoys nerdy things and she's terrified of being a person and what that involves.
Regular people grow and improve and become well-rounded and interesting due to their experiences. Spring sees this and decides "Why should I grow and improve or learn when I can select a personality from a show and use that? It's ready-made and I don't have to work for it.". Ultimately, the more time she pretends running away from herself, the less time she has to grow and become a well-rounded person like most.
If it's not being kin of something, then she covers her faults with whatever mental illnesses she decides she has. Whilst I think she could have something, she likely has one or two things and they're probably not on that list. When it's not kin or mental illness then she has to shave her head and put a plaster over her nose to stick out. Even then, the whole plaster over the nose thing is from anime and only shows how desperately she wants this fiction to be reality.
Tumblr only exasperates this by the continual hugboxing and approval it gives her. Tumblr is like the Build-A-Bear of hugboxes. You can sit in your own walled-off community and spew whatever vitriol you please at one another until it's deemed truth.
Spring is someone who looks for personal strength in all the wrong places. She tries kintypes, she tries being a diety, she tried explaining her faults on mental illness and the system. And there's nothing you or I or anyone can do to help her. The only thing we can do is laugh and hope she realises we'reaughing for a reason.