I've been on a Kumdori/Twinkle the Dream Being kick for the past couple of weeks. While I'm glad that all of the episodes of the cartoon have been found in English, the character was featured in a lot of other works being one of the first major mascots of Korea (Mascot of the 1993 Taejon Expo), quite a bit of which is lost.
- The Namu page for Kumdori mentions some "children's stories and short stories by Yu Gyung-hwan" and a novel which is "...seperate from the [cartoon]." Most likely, these are probably Korean only, assuming they are still available.
- The Expo had some live shows featuring the character, one of which is partly seen at the end of this special on the Expo itself: www.youtube.com/watch?v=rc4hSH4pZs4 It's possible that full footage of the show is already available, but hard to search for without the ability to type in Korean.
- There were some live shows at Kumdori Land based on the lore from "The Adventures of Kumdori". Like the previous media, it may still exist, but such footage doesn't show up if you look up "Kumdori," even with using Korean lettering.
- This video features some examples of lost Kumdori media: youtu.be/8ZVmMhPsY08 one is a comic (timestamp 16:00), while the other is a planetarium show (timestamp 32:39). Incidentally, the latter was available on the internet a few years ago, but I was unable to find it again as of recently.
If you have any information on them, I would like to know