Definitely a Bulborb

Definitely a Bulborb is a nondescript lifeform wearing a bulborb costume.

=In fanon games=

In Pikmin Evolution
Definitely-a-Bulborb is a Leafling pretending to be an enemy that is found in Pikmin Evolution. They are normal leaflings who wear suits making them look like various types of Dwarf Bulborbs, ranging from the red, orange, and bulbear variants. They are mainly found in settlements where in-universe they act as actors teaching young Leaflings the dangers of wild animals and what you should do when you should do when a hostile creature comes near. In-game they act as decoy enemies to help the player practice tossing Pikmin and they share the same behaviors of the creatures they are mimicing, however they of course can't kill Pikmin, only scatter them short distances away when shaken off or "eaten", leaving them completely harmless. Defintely-a-Bulborbs are also major facets of the Piklympics acting as the main targets in the Target Test and Striker's League minigames where they act as makeshift targets and bowling pins respectively. As their main purpose are to be targets in these two games, they don't move or attack the captains. In the Target Test minigame you have to carry their uncocious bodies to the ship for them to count as being shot down, while in the Striker's League minigame they will simply fly off the stage after being hit. Some Definitely-a-Bulborbs will be carrying balloons allowing them to fly, making them tougher to hit, or wear padded armor making them either as heavy as 25 Pikmin in the Target Test minigame or need two hits to take down in the Striker's League minigame. Overall the purpose of this "enemy" is to act as a harmless, often comedic obstacle that is linked to a specific objective or just act as test dummies to practice your Pikmin skills on.

Salem's version
Definitely a Bulborb is definitely, without a doubt, unmistakably, scientifically proven, a member of the grub-dog family. There is dark lore behind the truth of the individual inside it.