A third plot could be centered around a competition within the pantom guild to see who can earn the title of 'ace' by achieving a difficult task in the Naruto world. This task could be something like retrieving a powerful and dangerous jutsu scroll that is guarded by a fearsome beast. The characters would have to use their wits and skills from both their own guild and what they've learned about the Naruto world to succeed.
Another plot might involve the ace of the pantom guild forming an unlikely alliance with Naruto and his friends. They could team up to face a common enemy that neither group could defeat alone. For example, they might have to take on a powerful new villain who has a unique ability that combines the skills from both the Naruto universe and the pantom guild's world. This would lead to a lot of character development as they learn to work together and understand each other's ways.