The mage who walks in the heavens
(Newbie's work, description is weak, if you don't like it, I'm sorry)
Traversing other worlds, cultivating magic, and conquering other planes, he discovered that every plane was a familiar world. Marvel,(CD, anime, Hong Kong, 2D, none of these currently available), and so on…
"Hmm? Doctor Strange wants to borrow my power?" "Agreed."
"What, Harry Potter got beaten up by Voldemort, and you want me to come over and support him?"
"Gandaph, don't be idle, go help!"
"What is it? The Holy Master ran out again?"
"Ghidora, go and exchange a few moves with the Holy Master. If you lose, don't come back."
Merlin looked at the messages sent by the worlds under him and could not help but sigh.
"It's really tiring to be the big brother of the myriad worlds. I want to retire!"
This was the story of a mage walking in the heavens.
one of the better Harry Potter fanfiction I've read though it might be a harem fanfic romance hasn't happened yet so not much can be said on that end the female leads seem to be Daphne Greengrass luna lovegood and maybe padma patil