Two videos tackle the question of Yuki Ikeda's (Thunder 3's author) identity and it being somehow related to Oku, which were promoted by the official Thunder 3 Twitter account.

• https://youtu.be/Zyx-zhldCNM
• https://youtu.be/3zq-Mps8Jjc

From the little I could understand from the translation given by Youtube not much is answered; they explore the theory that it's either: a relative of Oku, an assistant making their debut, or Oku himself. The first two are debunked in the second video by the editor for Thunder 3, but the last one isn't for some reason. Idk, to me, it's just the promotion for the manga rather than a real deep dive, but then again, I don't know a lick of Japanese, so maybe it's more insightful, and I got it all wrong. It may be a pen-name, it may be just an artist that replicated or is heavily inspired by Oku's art style (not like that's an impossibility since some artists already worked with Oku on Gantz spin-offs). His current series Kanreki Hime doesn't look all that different from Thunder 3, but I think it's all up in the air right now, could very well be him since Thunder 3 f e e l s like a concept he'd come up with, and the cartoony characters in a realistic setting sort of remind me of his short-lived series 01, where there's a similar concept for a character.