Luigi's Mansion & Pikmin Player's Guide Interviews
I found on archive.org scans of the Luigi's Mansion and Pikmin strategy guides by Nintendo Power that contain interviews with some of the devs; I'll leave links here for further reference.
LUIGI'S MANSION: https://archive.org/details/LuigisMansionOfficialPlayersGuide/page/n89/mode/2up
Hideki Konno, Tadashi Sugiyama, Hiroki Sotoike
PIKMIN: https://archive.org/details/PikminOfficialPlayersGuide/page/n91/mode/2up
Shigeru Miyamoto, Shigefumi Hino, Masamichi Abe, Colin Reed
Other guides don't seem to have such interviews, unfortunately.