If we consider a crossover with a superhero universe, characters like Superman could be interesting. His strength and moral code combined with the alpha stigma concept could create a really unique dynamic. He could interact with characters having alpha stigma in ways that test his own powers and beliefs.
Another great option could be characters from the 'Star Wars' universe. For example, Luke Skywalker. His journey of self - discovery and his use of the Force could be paralleled or contrasted with the experiences of characters with alpha stigma in a crossover. His Jedi training and skills could be combined with the alpha stigma powers in unexpected ways.
Perhaps a story where a character with alpha stigma is transported to another world in a crossover. There, they have to adapt to new cultures and rules while also dealing with the implications of their alpha stigma. They might meet new allies or foes who are intrigued or threatened by their special trait.
Luffy from 'One Piece' is a great choice. His carefree yet determined personality would contrast well with Ippo's more serious and focused nature. They could bond over their shared love for adventure and fighting for what they believe in.
Ink!Sans is a popular pick. His creative and somewhat unpredictable nature can bring a lot of color (literally and figuratively) to a Glitchtale crossover. He could use his paint powers in the Glitchtale world in ways that no one expects. Also, Bete Noire from Glitchtale is a character that many fans like to include. Her relationship with other characters, especially her sister, can be explored in new and interesting ways when in a crossover situation.
One popular character to include is Batman from DC Comics. The contrast between Batman's detective skills and gadgets and Raiden's superhuman powers would be fascinating. Another is Goku from Dragon Ball. Goku's love for fighting and his ability to reach new levels of power could lead to some epic battles with Raiden. And of course, Samus Aran from Metroid. Samus' armored suit and her exploration of alien worlds could be combined with Raiden's adventures in a unique crossover story.
Definitely Balto himself. He's the main character and the centerpiece of any Balto - related fanfiction. Another popular character could be Steele. His antagonist role in the original Balto story makes for great conflict in crossovers. Also, Jenna is often included as she was an important part of Balto's story.
John Connor is often a popular choice. His leadership skills and importance in the Terminator series make him a great character to bring into other fictional universes. For example, in a crossover with a superhero world, he could be seen as a strategist working with the heroes.
Batman himself is obviously a must - include. His leadership and skills are central to the Batfamily dynamic. Also, Robin, especially Damian Wayne as his complex relationship with Batman adds a lot of drama. Nightwing is popular too, with his acrobatic skills and his own journey away from being Robin. Batgirl, like Barbara Gordon, is often included for her intelligence and fighting abilities. And Alfred, the ever - loyal butler, who often provides support and wisdom to the family.
In Ben 10 crossover fanfiction, many writers like to include Azmuth. As the creator of the Omnitrix, he has a wealth of knowledge and power. His presence can add a layer of depth to the story, especially when it comes to explaining the science behind the Omnitrix or helping Ben understand new alien forms. Also, Charmcaster is often included. Her magic abilities can create some interesting dynamics when combined with Ben's alien powers in a crossover.
Joker is definitely one of the most popular. His cool and mysterious demeanor makes him a great fit in various crossovers. Also, Morgana is often included as his sidekick. Another popular character is Makoto, with her strong - willed and intelligent personality.
Definitely Venkman. His sarcastic and witty personality can create great interactions in crossovers. For instance, if he were in a crossover with the X - Men, his humorous take on the mutants' powers would be hilarious.