Where did Sonic come from in SSE?

You're likely referring to the character "Sonic" from the video game "The Elder Scrolls V: Skyrim Special Edition" (SSE). However, there is no character named Sonic in the game.

It's possible that you're thinking of:

* A mod: Many Skyrim mods introduce new characters, items, or even entirely new storylines. There might be a mod that adds a character named Sonic.

* A misremembered detail: Perhaps you're confusing the name with another character from Skyrim or a similar game.

To help me understand your question better, could you please provide more context? For example:

* What type of character are you referring to? (NPC, enemy, creature, etc.)

* What are you looking for information about Sonic? (His origin, abilities, role in the game, etc.)

* Have you played any mods recently?

With more information, I can assist you better.