Shadow the Hedgehog/The Melancholy of Haruhi Suzumiya

Shadow as Haruhi (They Both are Anti-Heroes)

Silver as Mikuru (They Both are Nervous and Shy)

Omega as Yuki (They Both are Robots)

Maria as Kyon

Blaze as
 * Sonic as Haruhi
 * Shadow as Mikuru
 * Silver as Yuki
 * Amy as Kyon
 * Maria as Itsuki