Rui is a girl from Pokemon Colosseum. She had the ability to see Shadow Pokemon, kind of like theDimensional Scream from Pokémon Mystery Dungeon
In the English version of the game, Rui's skirt and shirt were lengthened. Which is good because originally, her midriff was showing and she wore a micro-mini that could probably be seen under on the UFO going up then down in THE UNDER.