Big the Cat is a himbo.

Sonic the Hedgehog has blue hair and pronouns (he/him).

In the Japanese manual for Knuckles Chaotix, Vector the Crocodile is revealed to be a Christian.

imagine being a robot just doing your job and suddenly some guy just rolls up with his hot bat friend and you start feeling uncontrollably funny and get murdered because your creator was detrimentally horny.

Gold the Tenrec Creator Evan Stanley stated on her Tumblr blog that she was leaning towards having Gold be either bisexual or lesbian during her time working at Archie. Unfortunately, the comic was canceled before this could be demonstrated in-universe. https://t.co/Yzmn3ooPGA

#AskSonicHey everyone, I have a question for Amy! Those rings look suspiciously similar to Shadow's inhibitors, are you holding back some sort of power?

According to Sonic lore, these are the same character.

Cream the Rabbit and Cheese the Chao's names are based on, well...cream cheese.

Sonic Rivals and newer material states that Eggman Nega is a descendant of Dr. Eggman. By the simple act of existing, this proves that Eggman either has sex or will inevitably have sex in the future, with a long lineage lasting for at least two hundred years.

Knuckles has a really long head.

While it's not outright stated, it's highly likely that the species chosen for Jet the Hawk, a professional user of Extreme Gear, was inspired by legendary skateboarder Tony Hawk.

Amy Rose's leg is clipping through her boot in her Shadow the Hedgehog render.