For allies, All Might could be an interesting choice even when they are babies. All Might might sense Izuku's potential and also see that Shigaraki could be redeemed if guided right. Another potential ally could be Aizawa. He could be the one who trains them in basic self - defense skills when they are kids. As for enemies, the League of Villains could be a problem for Izuku, as they might see him as a threat to their plans with Shigaraki. Also, some of the more evil - minded heroes who don't believe in second chances for villains like Shigaraki could be enemies.
Allies could include the remaining Stark family members. They would surely support the baby as it is part Stark through Jon. The Unsullied might also be allies as they were loyal to Daenerys. As for enemies, Cersei's remaining supporters could be a threat, seeing the baby as a rival to any power they might still hold. Also, the Night King's followers (if any still exist) could see the baby as a new target, a symbol of the new life they oppose.
He could make allies with versions of his classmates from different universes. For example, a more confident and powerful version of Uraraka in a universe where she has had different training experiences. They could team up and use their combined skills to face challenges.
His classmates could be his allies. They might be intrigued by his Pokemon - quirk and offer to help him train or use it better. For instance, Ochaco could use her zero - gravity quirk to assist Izuku in some Pokemon - quirk - related training exercises.
Elijah could be on their side. He is Klaus' brother and might understand the importance of the baby, especially if he sees it as a way to keep Klaus in line or to bring about a new era of peace among the different supernatural species. He could use his diplomatic skills to protect the baby from threats.
The fairies from Sleeping Beauty could potentially be allies. Despite their past differences with Maleficent, they might see the baby as an innocent and be willing to help protect it from greater evils. They could teach the baby about kindness and how to use magic for good.
When Madara travels through time, he might find allies in unexpected places. For instance, some of the minor ninja clans that were oppressed by the larger clans in the past could see Madara as a liberator if he offers them a better future. On the other hand, those who benefit from the current ninja world order, such as the Daimyo or certain powerful shinobi from other villages, might see Madara as a threat and become his enemies.
Potential allies could be his friends like Sasuke. Sasuke, with his sharingan and combat skills, could team up with Naruto in battles against those who fear Naruto's newfound genjutsu power. Enemies might include Orochimaru. Orochimaru is always interested in powerful abilities and would likely see Naruto as a threat to his plans.
The Ents could be an interesting potential ally. Their connection to nature and their power could be something that Sylvanas would want to harness for her own ends. On the other hand, the Uruk - hai, with their brute strength and loyalty to the dark forces, would almost certainly be enemies. Their chaotic and violent nature would be in direct opposition to whatever plans Sylvanas has in the fanfiction.
Allies would definitely include Naruto's closest friends like Sasuke and Sakura. They would stand by him even with his new identity. From the Dragon Ball world, Goku could be an ally as he has a good relationship with Beerus. Enemies could be those who want to use Naruto's connection to Beerus for their own evil purposes. For example, some rogue ninja groups might try to capture Naruto to bargain with Beerus. Also, any new villains introduced in the fanfiction who are jealous of Naruto's power would be his enemies.
As for enemies, Percy could encounter the Titans who were once banished there. They might see Percy as an intruder and a threat, and try to eliminate him. Also, the monstrous creatures that lurk in Tartarus, like the Empousai or the Chimera, could be his foes.