That is fine for the city at large, but not the school. They will all need names, and an excuse for why nobody has ever seen them before. If you claim to have only just transferred in, some students might be fooled, but how would you explain your absence from the records? Nothing is on-record for you, here. It will arouse suspicion.

[He shakes his head.]

Avoid the rasengan, as well, and any other ninjutsu that is likely to draw attention.