Marissa nn Riss for main character? WDYT?

I’ve been using Riss and Rissy as nicknames for my main character. She hates her full name - [name]Marissa[/name] - because she finds it too girly and preppy. I just read on another board that Riss sounds harsh. WDYT? Should I change it to [name]Marissa[/name] nn [name]Reese[/name]?

I think Riss is fine. I had a friend named Rysa (pr [name]Rissa[/name]) and we always called her Riss. I dont think it’s harsh at all.