Captain America would be a great addition. His leadership and moral compass could guide Ben in some tough situations. And then there's Wolverine. His healing factor and fierce fighting style would contrast well with Ben's more alien - based combat. They could have some epic battles side by side.
Thor is another good choice. His god - like powers could interact in interesting ways with Ben's alien forms. For example, when Ben is in his XLR8 form, he could race Thor across the cosmos. And Black Widow's stealth and espionage skills could be used to gather information about threats that Ben and the other characters need to face in the fanfic.
Obviously, Ben is a must - include character as he is the main user of the Omnitrix. Gwen can also be a great addition as she has her own powers and can provide support or be a source of conflict. Grandpa Max is another good character, with his experience and knowledge.
Max Tennyson is a great character to include. He has a lot of wisdom and experience which can add depth to the story. He can be the one to give Ben and Gwen advice during their adventures. Another good character is Kevin Levin. His complex relationship with Ben and Gwen can create interesting plotlines, especially if there are conflicts or reconciliations involved.
Evie would be a great addition. She's Mal's best friend and can provide support and advice to Mal in her relationship with Ben. Also, Jay and Carlos from the Isle of the Lost gang are good choices. They can add some action and humor to the story.
Definitely Ben Tennyson himself. He's the main character and the one with the Omnitrix. His different alien forms like Heatblast, Four Arms, and XLR8 can add a lot of action and variety to the story.
Gwen is an obvious choice. She can bring her magic skills and her relationship with Ben to the story. Also, Grandpa Max, who has a lot of knowledge and experience that can be useful in the fanfic. Another good character could be Kevin, with his ability to absorb materials and his complex relationship with Ben.
The Plumbers could be great characters to include. They could be helping Ben out in space battles, providing backup and useful technology. Characters like Max Tennyson among the Plumbers have a lot of experience and wisdom to offer in such situations.
Evie is a great character to include. She's Mal's best friend and has her own unique style and skills. Her knowledge of fashion could be used in a story, like if they need to create disguises or outfits for a special event in the fanfiction. Also, Jay could be included. His athleticism and thieving skills can add an element of action and adventure. He could be the one who steals a crucial item or gets them out of a tight spot.
Ben Tennyson himself is a great choice. His ability to transform into different aliens offers a lot of potential for interesting interactions with the magic of Fairy Tail. For example, how would his Heatblast form interact with a fire - using mage from Fairy Tail? It could be a really cool dynamic.
Gwen could be a great addition. She could be the voice of reason when Ben and Vilgax are at odds or she could have her own powers play a role in the story. Grandpa Max is also a good choice. His wisdom and experience could add depth to the fanfiction, especially when dealing with Vilgax. Another character could be Kevin. His ability to absorb energy could create some interesting interactions with Vilgax and also provide a different kind of friendship or rivalry dynamic with Ben.
Obviously, Willy Wonka himself is a must - include. He's the heart and soul of the factory. Charlie Bucket is also great as he represents the pure - hearted visitor. The Oompa - Loompas add a lot of fun and mystery with their strange songs and unique appearance. Veruca Salt can bring in some drama as she was the spoiled brat in the original story.