Luigi appears to be a sadistic, arrogant and manipulative traitor, as he's constantly been fooling and tricking his brother Mario into believing he's on his side. In his final moments, he shows arrogance after proudly posing over Mario's body before being thrown into the lava and uttering his final words while being burned in the lava “OH GOD NO!” And before he “died” he betrayed Mario to work with Bowser because he was always “Stuck inside his shadow” even though Mario loved him dearly