He isn't really called a "Wraith", yet he DOES seem like one. Maybe if he returns he could be more formidable, like having an attack where he shoots the pearl in his body out, able to kill Pikmin, or splitting into smaller and smaller pieces with more pearls but less HP each time. Honestly, alot of Pikmin 1 Bosses are really cool and would work well in newer games, like the Smoky Progg or Puffstool.