Mild crush 

A mild crush is when you have a crush, but it’s not as severe or serious as a full on crush.
You still like them, but you are ok with being friends or just strangers.

Another reason for a mild crush is that you know that you’ll probably never be able to be in a relationship with them so you lower the bar and don’t expect anything serious to happen between you and them.

“I just have a mild crush on them, it’s not that serious. I’ll probably never ever be dating them anyways.”

Mild crush by Biodrox December 8, 2021

mindcrush 

Crushes one develops on another's intellectual fortitude that, while occasionally pursuable, are not actively pursued due to the inherent irrationality of said longings -- and the fact you don't talk to him/her in real life or, well, at all. Targets often include former MIT linguistics professors and random guys who write for scholarly/incredibly esoteric publications, and maybe you.

"I have such a mindcrush on Steven Pinker."

mindcrush by UNCLEAR WHO May 24, 2005