>>281364486
I don't know if Toriyama drew anything for Kenshin, but it did happen the other way around after Toriyama's death, with a special cover by Watsuki.
This article is funny btw: https://www.cbr.com/rurouni-kenshin-dragon-ball-super-gallery-new-artwork-release/
>Disclaimer: Original Rurouni Kenshin creator and artist Nobuhiro Watsuki was convicted of possessing child pornography in 2018. CBR does not condone Watsuki's past actions or support his ongoing work.