Sonic's pals are also inspired by animals -
Miles Prower, better known by his nickname, Tails, is a two-tailed fox who is Sonic's best friend and sidekick. His name is a pun on "miles per hour".
Knuckles is a fictional red anthropomorphic echidna, the only living descendant of a well-established clan of echidnas. For many years, his clan guarded a giant gemstone called the Master Emerald, which controls the Chaos Emeralds, objects central to the Sonic the Hedgehog game series.
Princess Amelia Rose the Hedgehog, commonly known as Amy Rose, and formerly known as Rosy the Rascal, is one of the main characters from the Sonic the Hedgehog series. She is a mobian hedgehog with a major crush on Sonic the Hedgehog.
Miles Prower (マイルス・パウアー, Mairusu Pauā?), better known as Tails (テイルス, Teirusu?), is a character who appears in the Sonic the Hedgehog series. He is an anthropomorphic fox who, due to a genetic abnormality, was born with two distinct twin-tails, hence his nickname.
The character of Tails is portrayed as a very gentle, comforting, and humble fox.
Jules Hedgehog was the husband of Bernadette Hedgehog, brother of renowned scientist Sir Charles Hedgehog and father of world-famous Freedom Fighter and hero Sonic the Hedgehog.
In the games, Knuckles does not have a girlfriend (although it's hinted that Rouge and Shade has a crush on him). However, in the Archie comics, Knuckles' girlfriend is Julie-Su.
In the unaltered timeline, Sally at long last married Sonic, the love of her life. While they were deeply devoted to each other, Sally was often concerned for her husband's attitudes, particularly as he dealt with the frustrations of being king.
Introduced in the 1996 video game Crash Bandicoot, Crash is a mutant eastern barred bandicoot who was genetically enhanced by the series' main antagonist Doctor Neo Cortex and soon escaped from Cortex's castle after a failed experiment in the "Cortex Vortex".
Within the Sonic franchise's fictional universe, Shadow is an artificial, anthropomorphic black hedgehog created 50 years before titular character, Sonic the Hedgehog was born, by Professor Gerald Robotnik, the grandfather of series antagonist Doctor Eggman.
While many people over the years assumed that Pikachu was based on a mouse, a rabbit, or even a pika, its iconic design actually originated from a squirrel.
In “Tails' Crush”, Tails started to have a crush on Zooey during one of her daily routines. They had several encounters, during each of which Tails acted to act cool, romantic, manly or ritualistic towards her in awkward ways, when he only wanted to talk to her.
Silver the Hedgehog is a recurring character from the Sonic the Hedgehog franchise. He is a hedgehog who comes from at least two-hundred years in the future. He commonly travels through time to assist Sonic and his friends.
Although he is Sonic's arch-rival, Shadow is not truly villainous; as he is mostly considered an anti-hero mostly due to how he still maintains something of a friendly rivalry with Sonic and has done some questionable things but at the same time from how he has done things such as sacrificed himself to save others ...
In the Archie comics, Sonic's real name is revealed to be Olgilvie Maurice Hedgehog. He tries desperately to protect that information, possibly out of embarrassment. This name is not canon (official) in the game continuity, however, and he is simply known as Sonic the Hedgehog in the games.
Doctor Ivo "Eggman" Robotnik is the main antagonist of Sega's Sonic the Hedgehog franchise.
While Sonic, Tails and Knuckles all received minor design changes, Amy's clothing and hairstyle were completely revamped. She also had her entire figure redesigned to make her appear older. In addition to her redesign, her official age was changed from 8 to 12.
Maria Robotnik
Shadow and Maria bonded closely during their time together; Shadow's brotherly feelings for Maria were the closest he ever came to love. Maria seemed to be a guiding force in Shadow's life, doing her best to erase any doubts he had about the purpose of his existence.
Locke the Echidna – Knuckles' father and a loyal member of the Brotherhood of Guardians, Locke trained his son to guard the Floating Island, but seemingly abandoned him at a young age.
Knuckles, the echidna from the Sonic the Hedgehog franchise, has a well-known crush on his fellow echidna, Julie-Su. This crush is first introduced in Sonic the Hedgehog 3, when Julie-Su, who had grown up in the Dark Legion, visits Knuckles asking for his help to free her people.
In this cartoon, Sonic and his siblings Manic (Sonic's brother) and Sonia (Sonic's sister) are the hit rock 'n' roll band on Mobius called the Sonic Underground but in reality they are the children of the lost Queen Aleena, the queen of Mobius.
Manic The Hedgehog, a character from Sonic Underground, is Sonic's brother and the drummer in the sibling's band. Manic is the most laid back of the family (yes, there's somebody more laid back than Sonic), though perhaps this is because he doesn't have any powers. This never held him back, though.
Scourge the Hedgehog, formerly known as Anti-Sonic or Evil-Sonic, is a character that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. He was the Moebius counterpart of Sonic the Hedgehog, as well as the ruler of Moebius.