What is the spell of Wizards Waverly Place to be someone else?

There isn't a specific spell in Wizards of Waverly Place that allows you to transform into someone else.

The closest thing they use for transformations is:

* "Substitoot": This spell is used to swap bodies with someone else, but it requires the person you want to swap with to agree and to be within a certain radius. It's a temporary transformation, not a full-on identity shift.

It's important to note that the show is fictional and uses magic for entertainment purposes. There is no real-life spell to transform into someone else.