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I saw a theory about this a while back on YT but can't seem to find the video now (probably got deleted) and there's only been two Reddit posts about it so I think this might need some covering.
A: Killer gouges out his third eye which pisses Kaido off and makes him lose interest in Killer therefore Killer gets tortured etc. then becomes a SMILE user
B: Killer refuses to cooperate w Kaido so he get his men to "break his spirit" like he did w Luffy and Kid
- u/aichers's small theory on Reddit
- 100%Madison's theory on YT (haven't seen the full video so Idk how accurate it is)
Killer's Face
First off, we've never seen Killer's full face before which could indicate that he's hiding something. As a child he had his eyes covered and as Kamazo he had his forehead covered like Pudding does. You could say that him covering his face is just part of his design but when he was Kamazo there wasn't really any reason for Oda to keep his forehead covered when we've pretty much seen his whole face. Also, when he fought Zoro u can see the lines under his forehead which usually only appear under people's eyes. Even when they are on the forehead, they cover the whole thing and not just the middle like Luffy's face here. To back this up even more, the lines under Pudding's forehead only cover her eye area, similar to Killer's. It's very much possible that the three-eyed people are wanted by the World Government just like the Oharan scholars are, as they posses the power to read Poneglyphs, hence why Killer would need to cover his face in order to hide from them. This would explain why he wears a mask.Reasoning Behind His 3 Eyes
You might be wondering why Oda would make a minor character like Killer have such a rare and powerful ability. Well there's a few reasons for this. Firstly, Kid is meant to be a direct rival to Luffy and his dream is also the same as Luffy's so it would make 100% sense if he also had someone who could read Poneglyphs as his crewmember. Also, it wouldn't make any sense for him to go after a copy of Big Mom's Poneglyph (assuming that's what he took) if he never had someone who could read it. Furthermore, other than Zoro, Killer is the only non-captain Worst Generation member and we know Killer isn't very strong so the only logical reasoning behind Oda making him a Worst Generation member would be that he's a valuable crewmate in other aspects.Killer and Kaido [CHAPTER 999 SPOILERS]
We know that Kaido knows about the three-eyed people's power so it would be dumb of him to turn Killer into a SMILE user if he needed him. However, there's two scenarios that could lead to Kaido doing this to Killer (this part is pure speculation btw):A: Killer gouges out his third eye which pisses Kaido off and makes him lose interest in Killer therefore Killer gets tortured etc. then becomes a SMILE user
B: Killer refuses to cooperate w Kaido so he get his men to "break his spirit" like he did w Luffy and Kid
Conclusion
In conclusion, I'd say this theory has a fair chance of being true but it is based on a lot of assumptions and speculation so even if it doesn't come true it wouldn't really make much of a difference to the story, although it would ruin Kid's chances of becoming the Pirate King, which would defeat the purpose of his rivalry w Luffy. This depends entirely on whether Oda wants to continue w the Luffy/Kid rivalry or if he wants to move on from Kid after Wano.Previous Theories About Killer's 3 Eyes That I Could Find
- u/leopold_roger's theory on Reddit- u/aichers's small theory on Reddit
- 100%Madison's theory on YT (haven't seen the full video so Idk how accurate it is)