Alright... I'm gonna start by saying that I've NEVER noticed him before. Also, I'm pegging him as a brother, not a father. (I know that was random, but bear with me here) I write a fair deal of 6-7/10 stories on fimfiction, and this has given me a brilliant idea for a home-hitting feel story. All I ask is your permission to use this as the cover art (with credit given of course), and that you read it if you wish to do so. I shall return with a title and possibly a link in two days time. If I'm not back by then, send someone for my body.
Seriously though, that story will not be deterred unless I'm dead or you don't grant me your permission to use this as the cover art. I won't write it otherwise.
Wow! What episode did you watch? His mane is Rainbow. And I consider that mare not RD's mom. B/c she has been seen as a regular background pony and Dash has had no reaction to her. Lauren Faust likes to consider Fire fly RD's mom..since "Technically" Fire fly died giving birth to Dash. Y'know since hasbro lost the rights to the G1 names? And RD's personallity is based around Fire fly's. Yeah I know my canon.
Honestly, I love the design of Rainbow dash's father. He's a perfect color scheme compared to her; not too original, but also not an exact copy of RD herself. (I also love his eye color. Hasbro has made me a happy brony.) Awesome job on this!
My theory is...that since Fire Flye is technically not around anymore and Miss. Faust wanted Fire Fly to be RD's mom..RD's mom is dead and she was raised by her dad, mostly! I mean I take it as canon since Faust wanted RD's mom to be Fire fly.
A rainbow mane? That has LGBT written all over it. I can see girls having rainbow hair, but guys? And I'm not a fan of male ponies having pink or purple-like color coats. At least they haven't showed male ponies with pink on them.