so i came up with another thing; 401 has a birthmark on her left shoulder that is from her alien side
its the symbol and it will glow red when she "fulfills her purpose" and will ache when near things related to the alien species, like other symbols of it etc
(as for her "purpose", it's to basically wipe the earth clean of humans [technically inklings/octolings now] because her alien dad only wanted her to be his pawn so yeah)
and NO she will not die once she does that (if ever) but she will be considered useful to her alien dad. and yea he's still alive. he's been alive for hundreds of years