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LegoGuy77777 was a minor youtuber in the SMG4 series.
He made a few videos on the video game Roblox. He is currently inactive on YouTube.
He mostly appeared as a cameo in the Ssenmodnar series.
In this video, he's seen waiting outside the toilet room of the Princess Peach's Castle while another guy is pooping for several hours.
In this episode, he comes in the piano room of Big Boo's Mansion, but then hears the Dr. Dr. Eggman's voice saying "PINGAS!", and then gets afraid.
He makes a cameo appearance with other people in this blooper.
He makes a cameo appearance with two other citizens scared and stormed by the evil Ztar.
He appears as a customer, but a Spaghetti Monster bites his head off killing him.
LegoGuy77777's color code may be based on the LEGO characters (hence his pseudonym), who usually have yellow skin. It can also mirror MarioMario54321's because of the colours used. Most of the shades are very marked and he has the LEGO color scheme.