GnomeBob

I think that the Original Necromancer inherited the Original Hell Lord's abilities, but reached a dead end, so the Original Necromancer reincarnated while passing on the Necromancer abilities to another. In order to get the most benefits, the original Necromancer then bound his new reincarnation's Realm to the one who inherited his old job as payment. So the Mc's Sister is the reincarnation of the Original Necromancer. It was probably the green robed taoist that helped make it work.

Direct English translation of Midoriya probably. AKA, the unknowable language of the outer gods that drive all men mad, the language of MTL.

better to change it to, "Great Buddha!! Are you human or ghost?!"

still better than Longbottom.

If you want Americans to use the Metric System, tell them all to post the length of their Johnson for all to see. They will unanimously convert to the metric system to get a bigger number.

It's the same as a Lottery Advertisement. You won't win, but knowing it is there will make you spend money on tickets. The price is likely 3x higher than the materials cost.

if the timeline is self-correcting, Arcturus would be long dead by now.

ash makes for fertile soil. Some seeds won't even germinate until there has been a fire.

Who knows. My theory is that the Hell Master Reincarnated into the Necromancer, found the Great World, smashed the rune to turn it into a small world, left a Necromancer's legacy, then reincarnated AGAIN, and ended up as the MC's Big Sister. That would account for everything.