Guriguri

Guriguri are fireball enemies from the game Mario & Wario that travel along blocks and other objects. To weaken them, Wanda can hit them with her wand to make them smaller and slower, which allows easy passage in low-hanging spaces, although this is not useful for every situation. If they are on breakable obstacles such as Rock Blocks, Wanda can instead simply crack or disable their foothold; this makes them continue to float in a direction until they hit an object, but this can also make them leave the level. They are extremely similar to the Lil Sparkies of Super Mario World.

Perfect Edition of the Great Mario Character Encyclopedia
「グリグリ 種族 ゴースト族 性格 なんにも考えない 登場ゲーム M&W」 たたかば小さくなっちゃう ブロックにそって移動してくる、ケセラン（P78）に似たファイア系ゴースト族. ワンダの杖でたたくと小さくなって、スピードもゆっくりにする事ができる.

Guriguri Species: Ghost Tribe Disposition: Doesn't think about anything Appears in: M&W If you hit it, it'll get smaller. ''A ghostly fire that moves along blocks, similar to Lil Sparky (p. 78). By tapping them with Wanda's wand, they become smaller and their speed even slows down.''