Sonic the Hedgehog

Sonic the Hedgehog is the main protagonists in the Sonic the Hedgehog series and one of the main protagonists in Sonic the Hedgehog: Transformers Prime.

Personality
Ever since stepping into the battle against iniquity, Sonic has been the champion of peace and is renowned all over the world for saving it countless times. During his many adventures, Sonic has traveled from the ends of the world to the far reaches of space and time, facing countless trials that have tested him to the fullest, earning him many titles, allies and the scorns of several foes. Well-known for his cocky attitude, easy-going demeanor and somewhat short temper, yet strong sense of justice, compassion, and love for freedom and adventure, Sonic uses his abilities to protect the innocent from his world and those beyond from the forces of evil, especially his arch-nemesis, Dr. Eggman. Sonic is said to be "like the wind",  a drifter that is always on the move and is noted for being free-spirited and adventurous. He values freedom above all else and strives to live his life according to his own rules rather than the standards of those around him or for the sake of heroism and duty, never thinking twice about what other people say or think. Born to run, Sonic enjoys nothing more than traveling the world. Endowed with a strong passion for enjoying life, he is never in one place for long and always moves forward to look for his next challenge, making his life a never-ending series of adventures. Because of his need for freedom, Sonic loathes the idea of being constrained and being cooped up for too long makes him twitchy and restless.

Powers and Abilities

 * Speed' :  Sonic's been known as   'The Fastest Thing Alive.
 * Spin Dash: Sonic's signature move.
 * Homing Attack: Sonic spin dashes into his aimed foe.
 * Chaos Energy Manipulation: Sonic can manipulate Chaos Energy.
 * Transformation: With the power of the Seven Chaos Emeralds, Sonic can transform into any form he wants, with the exception of his dark form and his energon form

Transformation Forms

 * Dark Sonic: Dark Sonic is Sonic's transformation when his anger and negative chaos energy increases. As Dark Sonic, he still resembles Sonic, but his fur is a dark blue color and his body emits a dark blue aura. In the final phase of his transformation however, he looks similar to Super Sonic, and his back quills are longer. He still retains the dark blue aura around him, but his eyes have no pupils or irises, the mouth disappears, his fur is black and his skin is a dark gray color. Dark Sonic demonstrates light-speed movements, fast enough to tear through a robot multiple times within a second simply by dashing through it, while not even being visible. He also possesses very high physical strength, enough to make dents in metal, cave in a robot's face with one punch, and tear a robot vertically in half with one swift strike. Dark Sonic was also able to take on other powerful foes such as Mecha Sonic, Soundwave, even Megatron.
 * Super Sonic: Super Sonic is Sonic's iconic transformation when he harnesses the power of the seven Chaos Emeralds. In this form, Sonic's blue spines turns into a gold color, his peach skin gains a slightly golden hue, and quills upturned. Additionally, his green eyes become ruby red. Sonic's strength and already legendary speed are bolstered to high levels, and he is nigh invulnerable. Sonic also yields immense power, allowing to take on powerful opponents.
 * Energon Sonic

Dr. Eggman
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Tails
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Knuckles
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Turbo Mecha Sonic/Metallix
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Amy Rose
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Sally Acorn
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Metal Sonic
Metal Sonic is Sonic's robotic alter ego, created by Dr. Eggman for the sole purpose of destroying him. However, even though their appearances are similar, there is a certain difference between the two of them that goes beyond their obvious physical dissimilarities. While Sonic enjoys life freely and lives for adventure, Metal Sonic is obsessed with the one purpose he was made for and will cut off anything not related to that goal. As such, even though they are both super-speedy hedgehogs (albeit with one of them being a robot), their worldviews are completely different.

Metal Sonic is one of Sonic's earliest foes and his first true rival, being able to copy both his speed and power. Both of them share a strong rivalry with each other. Before Shadow and Scourge came around, Metal Sonic was Sonic's first real rival, and the two have always matched one another in battle, yet Sonic would always come out the winner.

Cream
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Shadow
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Rouge
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Fiona Fox
For years, Fiona harbored a dislike towards Sonic, viewing him as selfish for leaving her behind in one of Robotnik's prisons (unaware he had no choice at the time). Her perception of Sonic changed after he supposedly died to protect Mobius from a Xorda alien attack.

Fiona's interest in Sonic irritated Tails, who harbored a secret love for her. Eventually, Tails mustered the will to confront Sonic and Fiona about his feelings, but Fiona rejected Tails because of their age difference. Fiona and Sonic became a couple at this point.

Sonic and Fiona were in love until Sonic found out that Fiona was evil and she was dating Scourge, having defected from the Freedom Fighters to become a villain. Fiona had fallen in love with Scourge while he briefly impersonated Sonic. After trying to find the same attraction in him, she failed, realizing that she preferred his evil counterpart.

Sonic later revealed he began dating Fiona to help Tails get over her, and that at the time he was still hurt from his and Sally's breakup, indicating he may or may not have had a genuine interest in a long term relationship with her.

However, despite what happen, Sonic still seems to view her as a fallen friend, blaming himself for what happen.

Scourge
Though Scourge and Sonic the Hedgehog have nothing but hatred for each other, due to their identical abilities they do occasionally find themselves working together, such as when the pair and Shadow battled the sub-boss Croctobot (though afterwards, Scourge immediately and single-handedly defeated Sonic and Shadow, who left in a huff) and when they battled against both Metal Sonic and Metal Scourge.

Scourge thought he figured out why Sonic did not like him: all Sonic needed was one bad day, and he would be just like Scourge. Sonic stated the exact opposite, saying that all Scourge needed was some good qualities and he would be just like Sonic. This gave Scourge some self-doubt that let to him reinventing his own identity and making him a much greater threat than before. At the same time, Scourge has become a grim reminder to Sonic of what he would become if he went down a dark path.