I think any characters that require research in order to play them properly are inherently more difficult to play, but that isn't necessarily a bad thing. For me I especially want to make sure that I do important aspects of a character's fundamental identity justice (things like gender identity, sexuality, cultural background, ethnicity, mental health, disabilities), especially if they're different from my own, so I inevitably put a lot more work and thought into how I portray them, and where possible, I ask friends and fellow RPers who are part of those groups themselves to check me on things. I know I get things wrong sometimes though, but I don't want to not RP characters that are from underrepresented or marginalized groups of whatever kind just because of that -I'd rather learn and improve.