for the sake of clearness, assume the following:
1) just a date with a possible 1 night stand. no strings attached like commitment. you have a dinner date with some small talk in the way the cosplayed character would act, then you go watch a movie in the cinema and you walk your date home where you're invited for some coffee. it's your own choice how far you want to go.
2) the cosplayer is the same gender as the character that's cosplayed and is of legal age and of appropriate build and size. no fat dudes cosplaying Hermione or something like that, unless you're into that.
3) if you take the 1 night stand, you won't get an STD, there will be no pregnancy and if you have a significant other, they will not have any issues with it. it's completely consensual and noone will complain about it.
4) it can be any character of any gender and any race or species. if the cosplayed character is younger than 18 (like harry potter characters), it's a version that's 18 to prevent any legal issues.
5) the cosplay is well executed. clothes and appearance are 95% similar to the actual character.
so, if you could date any fiction char, not in person, but cosplayed by a real person and assuming the above, who would you date and why?
I think people who have read my posts in the Corrupt a wish threads likely have an idea of who i'd pick, but I won't pick either Ahsoka Tano or Holly Short for squick reasons. those characters are such strong female leads in their respective series that in my opinion, a date and 1 night stand would only detract from my enjoyment of them.
Instead, i'd go with Femshep, one of the best female leads to have graced recent gaming.