We need more of this. The name can change. But, I think she can keep her colours and a slightly modified cutie mark.

@Gundlach  
sniff  
BEST. FIC. EVER!

@Background Pony  
those were all BG ponies

I would headcanon it but I already believe they showed her mom in the flashback.

FF: “H-hi.”  
RD: “Hi.”  
FF: “Can I ask you a strange question?”  
RD: “Sure.”  
FF: “Who dyes your mane and tail?”  
RD: “Nopony. This is my natural color.”  
FF: “Really!? I love rainbows!”  
RD: “T-thank you.”  
FF: “I think they’re really hot.”  
RD: “Well I’ve heard that rainbows are extremely spicy.”  
FF: tackles RD  
RD: “Oh. Ohhhhhhhhhh!” O////O

@ze  
I accept this.

@LV-04
 
I was about to debate you on that, but if G3 Rainbow Dash is her mom, then that could explain why she never talks about her family.

@HJSDGCE  
Headcanon Accepted.

My head-canon is that RD has two moms, literally Firefly and G3 Rainbow Dash.

Due to copyright reasons, Hasbro can’t name a pony “Firefly” apparently :\  
…
 
I vote that Rainbow’s mom is named SERENITY!

@igotnopicks
 
She died giving birth to the greatest Wonderbolt ever.

And so, a legend was born… much later.  
For now, it was conceived.

Years later she dies.

Headcanon acquired.

hey, wanna make an element?

….headcanoned.

I’ve already decided this is my headcanon.

and then… they… fucked