OiramOiram12345 is MarioMario54321's Doppleganger and the main antagonists in the Story Mode. He first appears at Frozen Lake where He sends Oiram and Igiul to fight MarioMario54321, Starman3, Cirno, Pachirisu and Emolga.
In the Story Mode, OiramOiram12345 was the main antagonist but it later turns out to be GigaDeath before the Final Battle. The battle theme for his first and second battles is Aqua/Magma Leader Battle from Pokemon Ruby/Sapphire/Emerald and the theme for his last battle is Astral Babylon/Mobius Strip from Sonic Riders: Zero Gravity.
Standard Special: Iceball
OiramOiram12345 shoots a blue Iceball from his hand. If it hits an Opponent, they will be frozen for 3 seconds.
Side Special: Shadow Rush
Similar to Fox's Fox Illusion.
Up Special: Super Jump Punch
Same as Mario and Luigi's Super Jump Punch.
Down Special: Dark Void
Similar to Ness's PSI Magnet.
Final Smash: Storm of Darkness
Similar to Ness's PK Starstorm, But the Comets are black.