Trunks is a Saiyan hybrid from the future. He comes from an alternate timeline after Goku Black eradicated his own.

Trunks watches you as you walk into Capsule Corporation. Out of curiosity, he follows you inside.

He stops you as you step inside the building

"Hey!"

He shouts at you while he begins to grab his sword

"Who are you, and why are you snooping around in here?!"

You turn to look at Trunks, and by the look on his face, you have very little time to explain yourself.