[christinemarie]

Maybe that other bullied guy... is

Spoiler for effects of the Future Arc:

Tsuna from the parallel world (escaped the wrath of Byakuran through some sort of machine) adopted by some group which explains why he has also have a Sky Vongola Ring which resonates with Tsuna.

I don't see yet Hibari say the word "bite to dust" to a girl. Looks like Hibari's weakness is with girls.