Enter

• If there is no player within 15m of the ghost, fail
• Otherwise, pick the closest player
• Choose a random point inside the main collider of the room (or closest possible walking point, in that case the ghost may end up outside the targeted player's room) and teleport to the player
• If the ghost is a Banshee, roll 1/3 chance for Singing event, otherwise random selection
• Randomly choose one of the following event types (1/5 chance)

Sanity drain

• If one of the events described below collides with the targeted player (<2m), sanity of the player will drop by 10%
• If the ghost is an Oni, it will drop by 20% instead

Airball

• If the ghost is an Oni, replace with Walking event
• Moves towards the targeted player for the duration of up to 10 seconds

Walking event

• Ghost walks to the targeted player (usually continues to do so even after event ends)

Singing event

• Ghost stands at the place for 13 / 18 seconds (female / male) and sings, replace with Airball if Shade
• If the targeted player is Banshee's target, drain 15% sanity instead of 10%

Standing event

Mare:

• If the ghost is a Mare, roll 1/3 chance for light-breaking event
• Otherwise, normal logic

Normal logic:

• Choose one of the following events:
  • Standing
  • Light-breaking
  • Red room

Appear state aka one frame event

• Currently broken

NOTE

Because of the bugged Appear state, I'll use event chances only considering 4 event types