Frogmare

My Undertale tracks ranked.

Not only is it hard to distinguish between Chara and Frisk's abilities in the genocide route, but True Pacifist Frisk seems to specifically gain more power through their friendships with others.

In the True Pacifist run, the motivation given by Frisk's friends directly heals them from damage, which is something we don't see appear anywhere else. They also seemingly are able to repair their own soul despite not being able to save or reload, implying they have a unique power which goes beyond saving. As well as being able to tank an attack stronger than the power Asriel uses to end the Undertale Multiverse, which is a stronger feat than Geno Frisk theoretically ending the multiverse.