Shroomy is a character from the Luncheon Kingdom that first appeared in The Mario Channel: MARIO'S CHALLENGE. He appears at the end of the video, where he is the first one to enter the elevator, reach the roof and defeat Mario, being the winner of Mario's challenge. Since then, he has appeared in other videos such as SMG4: Mario The Boy Scout, as the highest achieving member of the boy scouts.
Usually, Shroomy is an optimistic and positive guy who speaks with a Southern accent and seems to enjoy crafting rocket launchers. Whenever he is about to fight someone, he always uses his trusty rocket launcher as self-defense. He also enjoys winning and mostly celebrates his victory by dancing. He usually never gets angry or sad.
He is shown to be fond of Professor E. Gadd, who while technically not responsible for creating him, was responsible for turning him into a robot.
He is bad at insulting, as shown as he can only come up with a generic, half-hearted insult at Saiko Bichitaru before coming up with a more emotionally-triggering one.
He had a crush on Po (despite her being usually portrayed as being psychopathic), however he was incapable of confessing it to her, which shows him being shy and insecure.
It can be assumed that even after being transformed into the Shroominator, he still has these abilities:
Crafting: Due to his years of experience as a Boy Scout, Shroomy is capable of crafting multiple objects within a matter of seconds. Such objects range from a rocket launcher to a camouflage tent to even a giant, wooden catapult.
Sharpshooting: Shroomy is a surprisingly skilled sharpshooter, almost rivaling Meggy in shooting as both of them are skilled sharpshooters. In SMG4: Wild, Wild Mario, he displays an impressive level of accuracy with a slingshot and also lands five bulls-eyes in a row in a game of darts.
Supersonic Speed: He can also activate his own supersonic speed, which is even more faster than his usual flight speed.
Laser eye: From SMG4 Christmas 2018: The Most Important Thing, although Shroomy had returned to his original body, he still had some of his Shroominator powers within him, as he accidentally fired lasers from his eyes, causing a giant sign to fall down and crush Bowser.
He is one of the best masters in Boy Scout camp considering he won many scout badges (300,679 to be exact).
In SMG4: Stupid Mario Odyssey 2, it is revealed that Shroomy originally hails from the Luncheon Kingdom. He also supposedly has family living there (depending on whether or not Mario ate them).
It is also revealed the reason he has part of his head bitten it was because of Mario biting it while eating the netizens. However, this makes no sense unless SMG4: Stupid Mario Odyssey 2 took place before The Mario Channel: MARIO'S CHALLENGE, which would mean Mario would have expected Shroomy to show up at the roof, thus creating a timeline continuity error.
Like Fishy Boopkins, he is one of the characters who has a voice actor instead of speaking in subtitles and audio clips.
However, instead of being voiced by Kevin like Fishy Boopkins, he is voiced by Luke Lerdwichagul. In most of the Hobo Amigos episodes, Luke intros the video in a high pitched voice that sounds uncannily like Shroomy.