Theories involving Haine!!
- He's Yami Marik having survived the Shadow Realm and possessed a child.
- He's Mr Tweetums.
- He's Mokuba
- He's Yami Bakura.
Theories involving Playable Characters!!
- Roxas is secretly Apophis.
- YOU FIEND!!!!
Theories Involving David Kinrab
- David is an emissary of one or more of the Gods. If he's on the side of good, then his Spellcaster deck and deceptive nature likely means he's a servant of Isis. If he's on the side of evil however, chances are he's working for the creatures that Apophis has sealed.
- David is an Expy of Rei Shingetsu /Vector from ZEXAL.