Personally it wouldn't bother me. I myself probably wouldn't cosplay a character from a series that I'm not at least fairly familiar with and like pretty well, but that's more because I don't want to end up in a conversation with a big fan of the series and not know what they're talking about. But I'd be fine with people cosplaying something they're not really a fan of as long as long as they still respect the series.
- Kuroko Tetsuya (Kuroko no Basket)
- Levi (Shingeki no Kyojin)
(Suggestions are always welcome~)