Are these real or fictional people? If real, I would personally change the names and possibly more just as a courtesy.
Making art with copyrighted material is in most cases not technically legal, but copyright holders often don't want to or don't have the time to go and take down everyone's artwork. Whether or not you make money is not a deciding factor in whether or not it's legal, but it might be a deciding factor in whether or not anyone will actually feel the need to make you stop.
Tl;dr - You'll most likely be fine, but it's possible you'll get a cease and desist