Minty

Minty is a mint-green pony with pink and lighter pink hair. She was not seen in the G4 series, but there was a prototype sold on Taobao (which I got on eBay) that was actually considered by Hasbro; it was sold in the Midnight in Canterlot collection set.

Depiction in the series
Minty is shown to have an extreme case of OCD (wants everything to be straight and neat; hoards), is clumsy, and usually breaks things. But she has good intentions and a big heart. She always wants what's best for her pony friends. Her friends always forgive her when she makes a mistake, which is often.

Relationships
Pinkie Pie— Pinkie Pie is Minty's best friend. Since Pinkie was the Christmas host in A Very Minty Christmas, Minty tried to tell her about something, and later was able to. (For more information, please visit MintyPie.)

Sparkleworks— Minty asked her for advice in AVMC, but to which Sparkleworks said she had to finish decorating the lampposts. (For more information, please visit MintyWorks.)