Rainbow Dash's Dad, maybe brother? Vector created in Illustrator, from My Little Pony Season 3 Episode 12 Games Ponies Play
All I know is Firefly better be her mom! If copyright is the issue change her colors minorly, or maybe keep one lightning bolt or add a third.. As for the name of her possibly Fyre Flye As for this guys cutie mark it was hard to tell exactly what it was possibly a rainboom or a rainbow coming out of the clouds, it was hard to figure out copied best I could.
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Not necessarily. yes, she was next to them, but Rainbowshine is a background pony found in a ton of other episodes, including "Sonic rainboom", making her the same age as Rainbow and ill fit to be her mother, thus she can just be filler. And while it is strange to have a rainbow related pony next to them, I believe it is merely a coincidence, and not her mother