- Harald + nidhogg + ragnir = Loki
- Xebec + darkness + quake + love? = Blackbeard
- Garp + nika + sword + shield = Luffy
- Roger + Devil fruit sword + ? = Shanks
Loki has pretty much already proven himself. Plus he’ll probably even gett Harald’s sword out of Jarul’s head to match him nightmare self
Blackbeard imo might already have Xebec’s special swordmanship somehow. With it only activating when he’s asleep. I even made a theory on it with the will of Xebec’s blade somehow being a part of him. It tying to Imu, Mihawk, cavendish, caribou, etc pot
Mihawk might deadass just be possessed. Blackbeard someone who likely has (at least) 2 souls in order to eat 2 fruits has normal eyes. The other personality probably only activating when he’s asleep. Something he doesn’t do much of
When Saturn and Imu lose themselves to Imu they have the same eyes and completely lose themselves
I made a theory years ago about the ties between Blackbeard and cavendish
Even longer ago a thread on mihawk and cavendish’s eyes on how they might be possessed by their blades in some way.
What if all 3 are weirdly enough connected to each other?…

We know that Blackbeard’s ship is called the saber of xebec obviously named after his father’s sword. So what if Blackbeard is literally possessed by his father’s blade somehow. How did it happen idk but still its between his mother, xebec himself, or his blade
We know Ace was named after Roger’s sword so Blackbeard being even more connected to his fathers could make sense imo
As for mihawk it likely has to do with his something he faced early on in his career as a pirate. What idk but he deadass might be a sword man if yoru did take over
I typed to much so ima also turn this into its own post
We already know Shanks was supposed to be Roger’s successor with Roger even giving him his strawhat and Shanks learning his fighting style. The main problem is as far as we know he’s just a 1 armed version of him. So even if he does have a devil fruit sword like his twin it’d still mean that without it he should still be weaker. Itd be interesting if he somehow gets his hand on Roger’s sword ace and carries his will through that. If he can somehow get his arm back even if it’s a fake even better. With ace being dead we know he can’t do it
So basically
- Loki gets Harald’s sword
- Blackbeard gets Xebec’s sword
- Luffy gets Nika’s sword
- Shanks gets Roger’s sword