It would be a great QoL addition to be able to tell which character has which dungeon explorable mode unlocked. Currently it is real discouraging to get to a dungeon on a toon in order to do paths for tokens only to realize you haven't played story mode yet (let alone remembering that story mode is per character).
Personal Story quests were recently added to /v2/characters/:id/quests which has been great. Hopefully something like /v2/characters/:id/dungeons could be added! Thank you!