Entrance:

Wario: Look at the left when he appears on your right.

Waluigi: Flash him in the hallway when he's there to get rid of him.

Kid's Room:

Yoshi: When he wakes up, find the button with a music symbol and click on it to make Yoshi go back to sleep.

Luigi: When he's in your room, turn off the lights and wait for him to make a banging sound.

Living Room:

Waluigi: If he's in your room, hide and look all the way to the right to see when he's gone or when he makes a sound cue when hiding from him.

Yoshi: If you see him behind the curtains, close it and wait for him to make a sound cue, then you can open it again.

Kitchen:

Ashley: Cook the mushroom for her when she's close to your room.

Toad: Cook spaghetti for him when he's close to your room.

Eating the pizza gives you the most hunger.

Bathroom:

Ashley: Use the sink when she's in your room and wait for her to go away.

Yoshi: Use the sink when he's in your room and wait for him to go away.

Wario: If he's in his 3rd phase, press the sound button to get rid of him, the 3rd phase is him about to leave the room.

Staircase:

Wario: Take a picture of him when he appears in your room.

(The Mario app doesn't do anything since the Staircase was unfinished)