Patroclus could be a great character to include. He was Achilles' close friend, and his presence could add an interesting dynamic. Maybe there could be some tension between Achilles' wife and Patroclus, not in a romantic way, but in terms of who has more influence over Achilles.
Odysseus could also be included. As a clever and wily character, he could interact with Achilles' wife in various ways. For example, he might come to her for help in getting Achilles to re - enter the war, or he could be a source of advice for her on how to handle the complex world of the Greek heroes.
Thetis, Achilles' mother, is a must - include. Her divine nature and over - protective attitude towards Achilles would surely create some interesting scenes. His wife might have to deal with Thetis' interference in their relationship or seek her approval.
Aquaman could be an interesting addition. Picture Mr. Freeze's freezing technology affecting the oceans. Aquaman has to come to the surface world to confront Mr. Freeze. They could have a battle where Aquaman uses his control over sea life and Mr. Freeze uses his cold - based weaponry. It would be a clash of two very different powers.
A werewolf could be an interesting character to pair with a vampire wife. Their natural enmity in most lore could create a lot of tension and drama in the story. But also, they could find common ground and fall in love, defying the odds.
It could be a time - traveling sorcerer who wants to change history for his own evil purposes and sees Achilles as a threat. The sorcerer might try to stop Achilles from getting back to his own time or use his knowledge of the future to his advantage against Achilles.
The main antagonist could be Agamemnon. In the original story, he and Achilles had a lot of conflict. In this fanfiction, if Achilles is fighting for Troy, Agamemnon would still be leading the Greek forces against him. His thirst for power and glory would make him a formidable foe, constantly devising strategies to defeat Achilles and take Troy.
Catwoman could be an interesting choice. Given their on - again, off - again relationship in the Batman lore, a fanfiction could explore them getting married and how they balance their different moral compasses. Catwoman's thieving skills could be put to good use in helping Batman in some cases, while also causing some friction between them.
With Arya Stark, Achilles could be a mentor - like figure. Arya is on her journey to become a great fighter, and Achilles, with all his battle experience, could teach her new techniques and a different perspective on combat. However, their cultural differences, Achilles from Greek mythology and Arya from Westeros, could also create some interesting clashes and learning opportunities for both characters.
Definitely her best friend. They could be there for her through all the mood swings, give her advice, and go shopping for baby stuff with her. Her parents, if they are part of the story's universe, would also be important. They could provide financial and emotional support. And if there's a love interest, he should be in it too, showing his care and concern, or maybe even having some doubts that they need to work through.
Hermione Granger from 'Harry Potter' could be an interesting addition. She could use her magic knowledge to study the mummy. Maybe she could find a spell to control or at least understand the mummy better. It would be a really unique combination of magic and ancient Egyptian mystery.
Professor Oak could also be an interesting addition. As a Pokémon expert, he might be fascinated by Mewtwo and try to study it. This could create a conflict as Mewtwo is not one to be easily studied. It could also lead to a deeper understanding of Mewtwo's origin and abilities.
Batman would be a great character to include. His no - kill rule contrasts with Deadshot's assassin nature. Their interactions would be full of tension and moral debates. Harley Quinn could also be included. Her chaotic personality could add an element of unpredictability to the story. She might team up with Deadshot for a mission or be a distraction during one of his hits.