Elio, to match both his usually carefree and incredibly friendly demeanor yet affluent background, switches to be formal and informal depending on who he's around.

For high-standing individuals, he addresses those with their proper titles unless either asked otherwise or if he straight up doesn't like or respect you.

In comparison, he super informal with his friends, becoming more extroverted and animated than usual while expressing more sides to himself - thus showing his closeness.

Typically, he swears every now and again, either in comedic situations or when wittily insulting someone. Also to display his accumulated wealth of knowledge, he will use cultural terms when necessary.