In Adventure Time fanfiction, the Ice Princess could find allies in many characters. Lady Rainicorn could be one. Her flying abilities and combat skills could be very useful for the Ice Princess. BMO could also be an unexpected ally. BMO might have some knowledge or technology that could assist the Ice Princess in her adventure. Additionally, Flame Princess could be an ally under certain circumstances. If there is a threat that endangers both the Ice Kingdom and the Fire Kingdom, they could put aside their differences and work together.
Finn and Jake are obvious allies. They are always up for an adventure and helping those in need. Their bravery and unique skills would be very useful.
His first potential ally could be the Lich. Since the Lich is all about destruction and chaos, just like Evil Finn in his evil state, they might team up. The Lich could provide some dark magic knowledge to Evil Finn to make him even more powerful.
The Fire Kingdom's Flame Princess could be an ally too. Her mastery over fire could complement Finn's powers in combat situations. Also, the various magical creatures in Ooo, like the gnomes or the fairies, could band together and support Finn. They might have their own ancient knowledge or magic that could be useful to Finn in his adventures with his godlike powers. Finn's kindness towards them in the past might make them more inclined to help him out.
Other dragon slayers could be her potential allies. They might recognize her skills despite her being a princess. Also, magical creatures who are enemies of the dragons, like phoenixes or griffins, could side with her. And some wise old wizards or witches who see her potential might offer their help.
Finn and Jake are great choices. Finn's heroic nature and Jake's laid - back but powerful abilities can create interesting interactions with the Ice Princess. Another good one is Marceline. Her vampire nature and the Ice Princess' ice powers could lead to some cool battles or alliances. Princess Bubblegum could also be a good pairing as they are both princesses, and their different personalities, PB's scientific mind and the Ice Princess' more emotional nature, could make for a great story.
Rena Rouge could also be an ally. With her illusions, she can create distractions and help Princess Justice in battles. They could come up with clever strategies together, like using illusions to mislead the villains while Princess Justice strikes.
Maybe Kurama, the nine - tailed fox inside Naruto, could be an unexpected ally in a new way. Since they have a bond, Kurama could provide Naruto with extra power and insights when dealing with time - related challenges. For example, Kurama might have some ancient knowledge about the flow of time that could help Naruto in his time - patrolling duties.
Leon Kennedy could also be an ally. He has his own set of skills and experiences in dealing with dangerous situations. In a time - travel scenario, Leon might be able to provide different perspectives and resources. For example, if Chris travels to a time where Leon has already been, Leon could give him valuable information about the local threats and how to deal with them.
One potential new ally could be a powerful pirate from the past. For instance, a pirate who was known for his great navigation skills. Luffy could use his help to explore uncharted seas more easily.
Gray might find allies in unexpected places. For example, there could be a hermit who has some special knowledge about time and demons. This hermit could help Gray navigate the time - travel aspects and also provide useful information about the demons in that era. Also, some of the villagers who have had their own experiences with demons might offer their support to Gray. They could provide shelter, food, and information about local demon activity.