The main point is that the MC is not the ONLY strong existence standing atop the world, but ONE of them. The thing I like about these novels/mangas is the MC's interaction with these other strong existences. I would prefer it if there would be no harem, transmigration, yaoi, yuri, shoujo ai or shounen ai. I'm thinking about something like: Elqueeness where the MC is one of the Four Spirit Kings, the Water Spirit King Ancient God Spoiler: where the MC is... originally one of the remaining True Gods, but reincarnated Tales of Reincarnation in Maydare: The World's Worst Witch (the webnovel raw version) Spoiler: where the MC is... one of the strongest existences that have ever existed on Maydare, The Scarlet Witch of the West Spoiler: Huge Spoiler And originally, was one of the Ten Gods who created Maydare
Yeah, I know these. I had already read the Tensei Shitara Slime Datta Ken (WN) and I'm just waiting for the LN translations to complete. On the other hand I'm not so sure about Solo Leveling and Overlord. Aren't these two more of an "I'm the strongest standing atop the world alone!" type?
https://www.novelupdates.com/series/maou-gakuin-no-futekigousha/ https://www.novelupdates.com/series/instant-death/ (this has op protag but i dont think he's a god or other supreme being) Sorry I just realized that these don't fall under what you want BUT there are interactions between op characters.
Emperor Domination. Obs: the novel mc sucks for me, but then, i hate faceslapp overpowered from start mcs (could tolerate overpower but really don’t like faceslap).