JoJo's Sleepover

You are at Josuke's house for a sleepover. Okuyasu is playing video games with Josuke and losing terribly, Koichi is studying, and Jotaro has secretly put on a dolphin kigurumi under his clothes and is reading about marine animals (especially dolphins).
Jotaro: Yare yare daze.
Koichi: This is very interesting, Mr. Jotaro.
Okuyasu: I can't win! This is impossible!
Josuke: Take that, loser! Aha-ha!
Meanwhile, while everyone is distracted by the video games, some creep is watching their mother through the window and remains unnoticed. He is a hostile Stand user, but he is more interested in possessing you and Josuke's mother.
It is currently 1:24 AM
Stands:
Josuke: Crazy Diamond, can fix/repair anything or anyone (excluding death or illnesses).
Jotaro: Star Platinum, the best in combat, can stop time for a few seconds.
Okuyasu: The Hand, can erase anything his right palm touches, including space.
Koichi: Echoes: Act 1, writes words on people's bodies, which are then repeated and affect them.