From the Super Mario Wiki
“YOU'LL PAY, LUIGI!”
Blooey, known to his friends as the "White Torpedo" is a feisty Blooper who joins Luigi on his quest to rescue Princess Eclair in Paper Mario: The Thousand-Year Door. He has obvious animosity towards Luigi. Mario first meets them in the plaza in Rogueport, where Luigi details their escapades in Rumblebump Volcano. Although Luigi claims to have successfully thrown Blooey at a monster, killing the golem, the green plumber actually tripped and sent Blooey crashing into lava. Blooey, sporting what would appear to be a golden tan, seems none too pleased with the adventure, however. He apparently got dunked in lava and now crispy fried, blames Luigi.
Near the end of the game, Blooey appears to forgive Luigi somewhat, but now appears even darker colored than before.
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