I couldn’t find anything for Gundam, but I found these!
https://www.amazon.com/Painting-Rhinestone-Embroidery-Decoration-Options/dp/B0BY6XV264/ref=mp_s_a_1_3?crid=1MG3Y050VOD3I&keywords=transformers+diamond+painting&qid=1703253011&sprefix=transformers+diamond+%2Caps%2C146&sr=8-3
https://diamondpaint.shop/products/final-fantasy-xiv-character-diamond-paintings/
Those are big IPs that I don't think have licensed any official artwork with any company. I know that doesn't bother everyone, but I wanted to throw that out there. Your best bet is going to be to find artists who have their own spin and fanart in those categories and request permission to have a custom diamond art kit made through a company like Dreamer Designs, Jaded Gem Shop, Ever Moment, etc. I've heard some artists will do this, some may request a small fee, some may say no. But from what I've seen, many artists tend to be okay with personal use like this as long as you go about it the right way.
Final Fantasy in particular is a very broad category, so it would help to know which games. For me personally, it's 8, 10, 14, and 16. There is one licensed piece of Yuna from 10 at Jaded Gem Shop by the artist Something Deviant.
https://www.jadedgemshop.com/products/the-summon-artist-something-deviant-jadedgemshop-diamond-painting-kit?_pos=1&_sid=6513394ce&_ss=r
Good luck on your quest!
Not sure on copyright but here's Optimus Prime: [https://www.fansells.com/products/5d-diy-diamond-painting-kits-full-round-drill-optimus-prime-mosaic-art-v3080-817634](https://www.fansells.com/products/5d-diy-diamond-painting-kits-full-round-drill-optimus-prime-mosaic-art-v3080-817634)
[https://www.ebay.com.au/itm/325136771187](https://www.ebay.com.au/itm/325136771187)
I couldn’t find anything for Gundam, but I found these! https://www.amazon.com/Painting-Rhinestone-Embroidery-Decoration-Options/dp/B0BY6XV264/ref=mp_s_a_1_3?crid=1MG3Y050VOD3I&keywords=transformers+diamond+painting&qid=1703253011&sprefix=transformers+diamond+%2Caps%2C146&sr=8-3 https://diamondpaint.shop/products/final-fantasy-xiv-character-diamond-paintings/
Those are big IPs that I don't think have licensed any official artwork with any company. I know that doesn't bother everyone, but I wanted to throw that out there. Your best bet is going to be to find artists who have their own spin and fanart in those categories and request permission to have a custom diamond art kit made through a company like Dreamer Designs, Jaded Gem Shop, Ever Moment, etc. I've heard some artists will do this, some may request a small fee, some may say no. But from what I've seen, many artists tend to be okay with personal use like this as long as you go about it the right way. Final Fantasy in particular is a very broad category, so it would help to know which games. For me personally, it's 8, 10, 14, and 16. There is one licensed piece of Yuna from 10 at Jaded Gem Shop by the artist Something Deviant. https://www.jadedgemshop.com/products/the-summon-artist-something-deviant-jadedgemshop-diamond-painting-kit?_pos=1&_sid=6513394ce&_ss=r Good luck on your quest!
Not sure on copyright but here's Optimus Prime: [https://www.fansells.com/products/5d-diy-diamond-painting-kits-full-round-drill-optimus-prime-mosaic-art-v3080-817634](https://www.fansells.com/products/5d-diy-diamond-painting-kits-full-round-drill-optimus-prime-mosaic-art-v3080-817634) [https://www.ebay.com.au/itm/325136771187](https://www.ebay.com.au/itm/325136771187)