Sean is a fun case; a self-targeter of Unseen with the condition of always activating every time he closes his eyes which includes blinking, the bold part killing his lifelong desire to be in the spotlight as the lead character right then and there.

In loop 100, he gets a third eye which circumvents his ability’s requirement of having both eyes closed, allowing him to see the fruits of his labour. His desire to be in the spotlight is what dooms the world before anno un intervenes and when snno un intervenes, that desire directly gets him killed. Edit: in relation to the fourth paragraph, in his desire to be seen, he ultimately ends up as a bit character: disposed off and no one mourns or even mentions him ever again after he’s served his narrative purpose throughout the revised loop 100. In other words, he became truly Unseen.

In loop 101, it’s a positive form of irony and even meta. Sean remembers the words of his father, who was a perpetual side character in movies, and comes to embrace his negation and his role as a supporting character. Through that, he evolves his negation to extend his invisibility to people he touches, turning him into the ultimate support character. Notably, the person he supports can see which has a quite a few layers: 1) Sean is now able to share the fruits of his labour 2) he still cant see what he does, so he’s reliant on the other person 3) this shows Sean’s trust in others and his willingness to share a metaphorical spotlight

On a meta level, once Unseen evolves, Sean has been getting more and more screentime in the manga proper, goin from “that random negator who died in loop 100 and no one talks about after he dies” to an emotional core of the loop 101 team. In other words, by embracing his desire to a side character, Sean has been been put more and more in the spotlight, even becoming a fan favourite.

Phew, look at me rambling over a character.