I noticed that their HAIRSTYLE influence their choice. Example: Gillian, Hair standing up, looks like paper Rock- 10% Paper- 60% Scissors- 20% Example: KENYoU, hair combed down, sharp tip at the end Rock- 60% Paper- 10% Scissors- 20% Example: Deloge, Hair Nice and Spiky, rising up Rock- 10% Paper- 20% Scissors- 60%
I Did an Experiment with Silfer and Ra Yellow duelists. 5 in 7 DID use the choice equivalent to their hairstyle. I have confirmed this.
*NOTE this also applies to girl duelists. Just look at their hairstyle and try to see what it looks like.
**This does not work for main duelsists, however, as their hairstyles are diffrent in every game. Such as Jaden or Alexis.