Mario symbol
Official artwork of a Boo from New Super Mario Bros. Wii.
Universe Mario
First appearance Super Mario Bros. 3 (1988)
MG appearance(s) Super Smash Flash 2
Species Ghost
Gender Varies
Alignment Evil
Created by Shigeru Miyamoto
Company Nintendo

Boo, known in Japan as Teresa (テレサ), is a ghost enemy hailing from the Mario franchise. It appears in Super Smash Flash 2 as a background character in Waiting Room and is slated to appear as an enemy in Adventure mode, though it is unknown where or even if it will be appearing as one.

Character description

Boos first appeared in Super Mario Bros. 3. These ghosts froze and covered their face if Mario looked at them, but followed him if he did not. They can only be destroyed if light shines on them (in the Super Mario Galaxy series), if Mario hits them with a Star powerup, or with a Spiny Shell in New Super Mario Bros. for the DS.

In the Super Smash Flash series

In Super Smash Flash 2

As a enemy

Unknown This article/section contains information of a previously confirmed feature for a game or similar media.

The original source that confirmed the subject has otherwise become obsolete, outdated or deprecated and has yet to be re-confirmed by an official modern source.

Mario symbol
Boo in Super Smash Flash 2.
Universe Mario
First appearance Super Mario Bros. 3 (1988)
Stage(s) it appears Mushroom Kingdom

Boos in Adventure mode.

Boos were initially confirmed to appear as enemies in the Mushroom Kingdom level for the game's Adventure mode. Any further information in unknown and whether it will appear is no longer confirmed.

As a background character

Boo with Luigi and Sandbag

Boo appearing on Waiting Room's Halloween themed.

Another Boo appears as a background character in the Waiting Room's Halloween theme, one of multiple holiday-inspired versions of the stage. It can be seen floating above the left couch in the background.