Shadow the Hedgehog

Shadow the Hedgehog is an anti-hero of Sonic the Hedgehog series. He is Sonic's arch-rival.

Gerald Robotnik
Gerald Robotnik is Shadow's mentor.

Maria Robotnik
Maria is Shadow's best friend, who was like a sister to him.

Dr. Ivo "Eggman" Robotnik
Shadow and Dr. Eggman can be both allies or enemies, depending on Shadow's goal.

Sonic the Hedgehog
Sonic is Shadow's arch-rival.

Rouge the Bat
Rouge is Shadow's closest friend since Maria's death, tough he only met her 50 years later.

E-123 Omega
Shadow and Omega are close friends and teammates.

Black Doom
Black Doom is Shadow's biological father.

Mephiles the Dark
Mephiles is one of Shadow's greatest enemies.

Silver the Hedgehog
Silver is Shadow's descendant, fan, mentee, friend and son figure.

Miles "Tails" Prower
Shadow and Tails are either allies or enemies, depending on Shadow's goal.

Knuckles the Echidna
Shadow and Knuckles appears to have a dislikeness towards each other.

Amy Rose
Amy reminds Shadow of Maria.

The Commander
The two were initially enemies, but they later made peace with each other.

Metal Sonic
Shadow and Metal Sonic are either allies or enemies, depending on Shadow's goal.

Charmy Bee
Charmy have a great admiration for Shadow.

Espio the Chameleon
Shadow and Espio are close friends.

Vector the Crocodile
Vector is Shadow's friend.

Infinite
Infinite is Shadow's enemy.