Yugi is led by the will of a possessive ghost pharaoh that helps him do things that Yugi can't. For example, murder, children's card games, and mind crush. This is very similar to Remmy in Ratatouille who helps him cook and date.
Ratatouille is just Yu-Gi-Oh GX without the one and only chazz! Although you can probably make slight connections based on s3 plot