So you know what one change would have fixed alot of the problems with phantom planet. Danny getting rid of his powers. Instead vlad should have taken them like a plasmius maximus but meant to be permanent. You do that and then dannys low point is giving up because vlad won and he feels completely defeated and powerless. After all Danny Fenton is a weakling who cant save anyone. at that point someone yells at his dumb ass (i think sam or val would work) that they are all human and have been fighting ghosts. and he decided that hes gonna keep fighting even without powers. He can get them back eventually still, but the important part is him realizing hes not a hero JUST because of his powers.
( i have few other idea for PP adjustments but this post is about that ONE big problem. Bad danny characterization.)