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Il Piantissimo is a guy dressed up as a Pianta. In SMG4's videos, he debut in Stupid Mario Sunshine where he has one of the Shine Sprites but refuses to give it to Mario unless he wins a 1 on 1 race against him. Mario ends up winning and Il Piantissimo gives up the Shine Sprite. Later, he found Bowser Jr.'s paint brush and used it to paint and scratch his butt.
He then appears in SSENMODNAR 12 - STOLEN SPAGHETTI EDITION, in which he steals Mario's spaghetti. He gets away for most of the episode, but is later captured and punished by Mario. He gets tied up, and has the Kazotsky Kick performed atop of him by Heavy/Heavy Weapons Guy.
He makes a cameo in SMG4: The Movie Audition, he one of the characters in the long line.