It’s completely unrelated, but some of the humor and attention to detail found in Ikeda’s illustrations reminded me of another japanese artist mostly unknown in the West, Tiger Tateishi (I tried to create a Wikipedia page once and it got removed, but since then I got two of his books as a present from my wife… so next time it will be properly sourced :D).
Wholeheartedly recommended — here’s a b&w example https://samim.io/p/2021-01-14-illustrations-by-tiger-tateishi-1941-1998/, but there’s a lot more accessible via google images.