Well what do you know: Nintendo had thought of Bowsette before the internet did, and the character was nearly in Super Mario Odyssey.
Though Bowsette is a character that took the internet by storm, it isn’t a real Nintendo creation, rather fan art that was spawned from the odd introduction of Toadette during this month’s jam packed Nintendo Direct. Or, at least we thought this idea of a Bowser and Princess Peach combination was entirely made up by fans, until today’s release of The Art of Super Mario Odyssey in Japan.
Source: IGN.com Concept Art Shows Bowsette Was Nearly Canon