I am 100% convinced that the Pandora, the jewel that Kaitou KID looks for and grants wishes, is actually Kaito himself.
Like, Toichi found Pandora, gifted it to Chikage under the moonlight, saying some romantic shit, and one of them confesses that they want a baby. And that rock goes, Okay! and just... poofs into a baby.
It could even explain why Kaito looks so much like Shinichi! If that's the only baby either of them know and Pandora shaped itself on their subconscious desires, then it easily could have made itself look like Shinichi, but with more of their own features than the Kudos.
Shinichi: Did you steal one of the neighbour’s garden gnomes again? They’ve been standing out there glaring at them suspiciously for the past half hour.
Kaito: Nah, I got bored of that months ago. I’ve actually been adding new ones to their collection every few days for a couple of weeks now. I was wondering how long it would take them to figure it out.
Mrs Sato: I don't want to pressure you, dear, but you are a woman now. I would like to see you settled before I ascend to heaven and live with the angels.
Miwako: And with dad?
Mrs Sato: No, he's not there. *looks towards the floor*