How to keep a anime fan girlfriend?

I'm thinking about asking this girl out and she likes me but some of my friends had this question from my times dating anime fans and cosplayers, how to keep a cosplay or anime fan girl?

The same way you would anyone else. Make sure their emotional needs are catered to, respect them and their interests (Even if they like trash), don't force them to cosplay the characters you want them to, let them decide for themselves, make them feel appreciated but challenge them just enough to keep them engaged. (Preferably playfully.) Watch plenty of shoujo manga and try to see what girls get out of those bishi traits. Under no circumstance should you emulate them however. Find your own way to reverse engineer bishi swag to be compatible with real world human evolutionary psychology. These are sweeping generalizations, and it changes from girl to girl. Also make sure they understand that it's a co-op campaign, and you have your own emotional needs. I uh... Hope that's useful.

do cosplays with them, couple cosplays i think is the term, let them choose what you two will cosplay as. make anime jokes every now and then that theyll get.

We're all human my dude, just handle it the same way you would with any other girl. Just be there for her, show you care, respect her at all times, excite her with what she finds appealing about you, let her know you're thinking about her but also give her space when she needs it and definitely spend time together doing fun things that appeals to both of your interests and just generally being a good boyfriend she can adore. Oh and fun teasing, that's always great. Sure you might get into arguments which is normal for relationships but as long as you're not a doormat and can diffuse situations quickly and calmly then where you can both work together to figures things out then I think you're definitely on your way. You can do it my dude! :D

Sooo... You give no information for any one to give real advice off of, only " I'm thinking about asking this girl out and she likes me". Does she actually like anime? Is anime or cosplay even central to her life? Does it really matter one way or the other if she even cares about anime or cosplay? You have past experience with women who do like those things, is that something that you wish to return to? Are there other interests that might make difference? She likes you, but what do the two of you know about each other? Bliss, "You sound like someone who is neither a cosplayer nor an otaku. " Based on what he said here or your assumptions? I'd say you can't weigh it either way with the info given. And, I truly hope you dont believe as a grown man that one must conform in order to be liked. If you like or someone likes you based solely on a hobby, they are shallow. There's so much more to what people are than hobbies.

@oof https://www.dailydot.com/wp-content/uploads/2018/05/tposetoassert.png