Among my strongest characters go pretty high up the scale.
A original DBZ-related character(the style of Ki is the same) but that's about where the similrary ends; they naturally have a lot of raw power. Made more, in the fact in the place he was created the higher statements, feats and what not of DBZ aren't taken as hyperbole.
Xelena is takes the "Any sufficiently advanced technology is indistinguishable from magic" to its logical extreme. She was created by a race called the Nalga along with others like her, a race of androids dubbed the Alphalim. Essentially, their androids capable of going tow to tow with Eldritch Abominations and cosmics in general. One of their main things which make them effectively is they can pernametly kill them. They were created to stop a race of Eldrith Abominations that had been causing other Multiverses to crap themselves, though of course it was a group effort but they sure as hell helped. In the current time she's depowered from what she was. Either way, Alphalim are monsters.
Mikata is a Devil who, actually once wasn't all that powerful(at first) she started off as an antagonist of sorts to the main good guys because of being tricked. Long story short of it, the main bad guy tricked Mikata into thinking the big head had killed her family before banishing her some place as her family were angels. Anya doesn't care about any of that, just that you're a good person but Mikata didn't know that at the time. Anyway, she's basically like a good, female version of the devil in that universe, sort of.
If it came to a fight though, Xelena would win but man would there be some serious collateral damage. I know there's more powerful characters of mine but drawing blanks as I've had so many. So including the non named ones, yeah, hope whatever realm/universe they fight in has insurance.