Igiul is Luigi's Dopplegänger, he works for OiramOiram12345 and is one of his closest dopples, and was the main antagonist of IGIUL! and IGIUL TWO!!. He was defeated along with OiramOiram12345 and the other dopples in OiramOiram12345 and the Dark Star X. Igiul makes the people in the castle think that Luigigame2 was him. Igiul caused trouble and soon MM54321 kicked LG2 out of the castle, but later it was proved that LG2 was innocent when Mario realized it was really Igiul.
Fun Fact: Igiul's color code is similar to LuigiGame2's color code (the only difference being the shoes and golves), which is why LG2 was framed for those actions.