The Voltron Character Art File is a large paperback book compiling character model sheets used in Voltron Legendary Defenders production and is the closest thing the series has to an art book. This book was given away to animators who worked on the show after the completion of Season 8 and a limit quantity exist, due to the circustanse needed to even own one of these books they have become extremly rare and if more well known I'd say sought after as well.
The first picture of these books online is from the 13th of December 2018 and was taken and posted to an account affiliated with Studio Mir.
In the picture that was posted we can estimate that their are around 20ish Books possible more out of frame, but we can klook deeper while I was confident this picture was taken at Studio Mir's Seoul Office.
A picture of the cake that was cut during a party held to celebrate the completion of Legendary Defender uploaded by the same account features a logo from the store the cake was bought from.
After doing some digging I can confirm the Cake was ordered from a small buisness thats specialises in custom cake orders with printed on designs located nearby their offices in Seoul.
This was also an excuse so I could show you the Voltron cake :}
The pictures below were taken from archived Ebay listings and have been slightly altered using photoshop to be more visible and brighter. For more information and pictures of the Voltron Character Art File check out this Reddit post.
Character Height Sheet
Allura Princess Dress turn a round
Allura Expression Sheet
Keith BOM turn a round + Blade
Wormtron and the Lions <3
S2 Ep2 Background characters
The aliens that try to eat Shiro in S2 Ep1
Ulaz in the BOM Uniform
Lotor Expression sheet [Sinister lighting]
Zethrith Expression sheet
Trigel turn a round sheet
Kova before being exposed to Quintesence
Young Zarkon Expression sheet
Bob's Sidekick Norlox turn a round
Young Lance turnaround from S7 Ep1
The MFE Pilots
Curtis turn a round <3 I actually really like Curtis maybe it's causes he reminds me of my oc Amelia they are so identical they could be twins
Haggar/Honerva and baby Lotor from S8 Ep2
Height Chart for the Alternate reality in S8 Ep12
Warlord Lahn turn a round from S8 Ep3
The Galra Archivist turn a round
While some glimpses of VLD production materials like the ones included in the Character Art file have appeared online alot of them are grainy pictures like the ones shown here.
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Recently some model sheets that were in the collection of packets that riderjetfire was able to salvage from Dreamworks have been put up for sale on Ebay.
King Alfor from The Rise of Voltron [From Days Long Ago]
Keith from S1 Ep2 Some Asembly Required
Lance from S1 Ep9 Crystal Venom
Allura from S1 Ep9 Crystal Venom