OP guy (centuries old but looks 25, good looking) lives out near the forest, almost at the edge of civilisation. He has built a small house, farms, and because his powers so incredible (give him the most OP of them all; telekinesis, telepathy, understanding of languages and concepts, unlimited mana and skill to manipulate it etc), he lives in harmony with nature.
One day, he visits the nearby town, and picks up a ragged orphan girl who was being beaten in an alley (don't ask me how, that's up to the writer). This is the story of the OP man seeing his "daughter" cross the stages of life he had forgotten about with age, come of age, go through education etc.
If possible, I'd like some comedy and some romance on the side for OP too. Thanks!