If you notice and look closely, each face of Orochi, Shuten Doji, and Yinglong looks similar each other. Furthermore, if you compare Yinglong's theme to Orochi X's, you will recognize that they share similar passages.
The original characters have a moveset-scheme based on either Dynasty Warriors or Samurai Warriors' respective engines. The reason for this is their origin/ethnicity: if the character originates from China or if they're Western, they'll have a move set based on Dynasty Warriors. If the character originates from Japan, they'll have a move set based on Samurai Warriors.
While a majority of story-based team comps make little if not any sense, consider why Guan Yu was paired with both Fu Xi and Yinglong in Ultimate during Yinglong's debut stage: Guan Yu himself is actually worshiped as a god in real life, as if the statues of him in any local Chinese shop wasn't obvious enough.
Fridge Horror
Three of the Ouroboros Bracelets in 4 bear the powers of Freyja, Thor and Tyr. Given how Loki treats the wielders of those, it's likely they were the friends of his Odin killed. If that's true, it means Odin murdered his own wife and two of his sons in an attempt to escape Ragnarok and his death at the hands of Fenrir.
