Dr. Eggman might also be a part of the story. He's the main antagonist in the Sonic series. His evil plans could be the catalyst for Sonic and Shadow's encounter. Whether it's stealing chaos emeralds or creating some new doomsday device, Eggman's actions could force Sonic and Shadow to interact and either fight against or alongside each other.
In such a fanfiction, they might start as rivals. Sonic, with his speed and carefree attitude, could initially clash with Shadow's more brooding and serious nature. For example, they could compete in a race across a fantastical landscape filled with loops and obstacles. Sonic would be in it for the thrill, while Shadow might see it as a test of his own abilities.
Dr. Eggman could be a great main villain. He might have a new plan that involves both the power of Sonic Underground's music and the Chaos Emeralds that Shadow guards. He could try to create a device that amplifies negative emotions through music and uses the Chaos Emeralds' power to spread chaos everywhere.
Obviously, Sonic and Maria are the main characters. Sonic is known for his super speed and heroic nature, while Maria is often portrayed as a kind - hearted and intelligent girl.
There could also be other characters depending on the specific fanfiction. Some might include Dr. Eggman as an antagonist, always trying to cause trouble for Sonic and the Freedom Fighters, or other minor characters that add to the story's complexity and depth.
Obviously, Sonic and Queen Aleena are the main characters. Sonic, the blue blur known for his speed, and Queen Aleena who might have her own unique powers and leadership qualities in the fanfiction.
The main characters are, of course, Dark Sonic and Shadow. Dark Sonic is a more menacing and chaotic version of Sonic. He has a darker personality and often acts on more primal instincts. Shadow, on the other hand, is a complex character with a tragic past. He is a powerful hedgehog created by humans. In the fanfiction, they are the central focus, with their interactions driving the story forward.
Classic Sonic could be the most interesting. He represents the roots of Sonic. When he meets Modern Sonic, he might be curious about all the newfangled things like Sonic's modern shoes or his new power - ups. His reactions to the modern elements would add a lot of charm to the story.
Tails is a very popular character to include. He is Sonic's best friend and his technical skills can add a lot to the story. For example, he could help Sonic and Shadow figure out some complex machinery or technology that is part of the plot.
Sonic himself is always a popular character in this type of fanfiction. Whether it's Sonic from Sonic Boom or the modern Sonic, he's the central figure. Tails also tends to be popular as he's Sonic's sidekick in both versions. His intelligence and ability to create gadgets can play important roles in the crossovers.
Sonic himself is usually really popular. Whether it's the Sonic from Sonic X or Sonic Underground, he's the main hero and often at the center of the action. People love reading about his adventures and how he deals with the challenges in the combined universes.