Oh boy this is a weird one. Yes, you read that right it's SIONA and NOT "Sonia". The biological daughter between Fiona Fox and Shadow The Hedgehog. Although I tagged her main outfit, most images she appears in she doesn't even have clothes. Her clothing's design pattern is guaranteed to be inconsistent. Cute character though!

Her first appearance (from what I can tell) was in 2015 from a Palcomix/Mobius Unleashed ???? comic. You can find it on most Rule 34 sites but good luck trying to read it in order. As for who "created" the OC? I'm not too sure, but bbmbbf seems to be the main culprit (he's the author of the comic).