The answer was 15. Though he could also be 16 due to Sonic Generations.

How old is Sonic the Hedgehog?

Sonic first appeared in the game Rad Mobile as a keychain cameo back in 1990. Just a few months before the release of the first Sonic game.

What was Sonic’s first appearance in a video game?

The answer was Shadow. He is the second most popular character besides Sonic of course.

Who is the most popular Sonic character besides Sonic?

Yes. The Archie Sonic Comics hold the Guinness world record as the longest-running comic book franchise based off a video game.

The Archie Sonic Comics are the longest running comic based off a video game?

The original name for Shadow was Terios. Which means reflection of. This could also be a hint on why Sonic was confused for Shadow back in SA2.

What was the name for Shadow’s beta design?

Yes. Princess Sally was the first female character to be created back in 1991 for the Sonic the Hedgehog bible. Though her first public appearance was in the Archie Sonic miniseries back in 1992.

Princess Sally Acorn was the first female Sonic character to be created?

The answer was Sanic. The Sanic meme was officially put as a t-shirt in Sonic Forces. (It’ll also appeared in the first Sonic Movie)

What Sonic meme officially appeared in the main Sonic games?

The answer is Miles Prower. The name Miles Prower is actually a pun on "miles per hour."

What is Tails’ real name?

The answer is Nazo Unleashed. It was a fan animation released back in 2006-2007 and has become one of the most iconic and influential pieces of Sonic fan content within the Fandom.

What is the name of the most iconic Sonic fan animation?

False. Sonic ‘06 is the second lowest rated game within the franchise. The real lowest rated Sonic game is actually Sonic Boom: Rise of Lyric released back in 2014.