@Alida_femke So, let's say Nico somehow becomes immortal (looks around early 20s) and centuries pass and we're now in the bnha timeline. Nico sometimes acts as a vigilante and gets Nezu's attention, who later finds pics or something with him from different decades looking the same, so he hires him as a teacher. I imagine he'd teach history, given the fact that he's immortal, and also take part in hero training and maybe teach the students how to fight with weapons? I'm curious how the students will act if they find out about Nico's past
Also, if you have him standing close to Tokoyami make Dark Shadow get stronger since Nico is basically darkness :)