Some ideas

Beekeeping Bug Type leader

A shy and/or boring guy with a flashy Gym Leader persona using Dragon/Flying/Electric/other flashy Type

Researcher studying Dynamax through a lot of time in the Wild Area exploring *dens* using some tough Type

An athlete with whatever Type because not everyone has to conform to some elemental archetype

Obviously I still have no clue what, if anything, I want to reserve. At this point I'm happy to take any type that somewhat fits the character I eventually choose. Decisions, decisions