I agree with knuck's suggestions of full manual control. I'd take that to mean Fuji, however. I have an X70 that I love. I can recommend that, but I can't say how it compares to other/newer models. I wouldn't wish a Canon camera on my worst enemy (and i wouldn't even think enough about a Nikon to decide whether my enemies might like one.)
Also, fwiw, if I had a teenager with a budding interest in photography, I'd buy them a Pentax K1000 (with a 50mm normal lens), a pile of Tri-X, and a class on how to use it. https://www.photoretro.biz/workshops.html