Ah yes, the siblings. All of them are bat ponies. Eek!

Explanation (FYI, see the pony types):
U - Curvy V. He's chubby. His cutie mark is a magnet.
V - The happy ones but a coward. The bat mark in his neck is a tattoo. His cutie mark is a two lightning bots making a V-shape.
W - ARE THEY'RE A SHINING REFERENCE!? Twins and conjoined. Double-U, right (in some languages like Spanish called it as "Double-V")? Their cutie mark is a chain. Tbh, ponified W is the hardest to vector due to the braids, but thanks to my old vectors, I can vector ponified W quickly.

I traced them in screencaps, can't credit bases because it's very negligible. Except for PonkusDraws and MeiMisuki

Alphabet Lore belongs to Mike Salcedo

Made with Inkscape.
The SVG files are in a ZIP folder, Separated versions, & Cutie Marks: www.patreon.com/posts/81680126
Pixiv: https://www.pixiv.net/en/artworks/107322840