I was watching Junjou Romantica, and I thought to myself, "This could be a Sonic thing!" These are the casting roles:

Misaki Takahashi: Sonic the Hedgehog

Akihiko Usami "Usagi": Shadow the Hedgehog

Hiroki Kamijou: Silver the Hedgehog

Nowaki Kusama: Mephiles the Dark

Miyagi Yo: Knuckles the Echidna

Shinobu Takatsuki: Tails the Fox

Haruhiko Usami: Mighty the Armadillo

Sumi Keiichi: Scourge the Hedgehog

Takahiro Takahashi: Manic The Hedgehog

Eri Aikawa: Amy Rose

Fuyuhiko Usami: Vector the Crocodile

Tanaka: Daniel Doggerson the Dog (My fan character)

Tsumori: Fleetway

Isaka Ryuichiro: Antoine D'Coolette

Asahina Kaoru: Espio the Chameleon

Kaoruko Usami: Sally Acorn

*Note* Some of these roles are fitting, some aren't. Some I gave a lot of thought into, some not so much. No flaming please!