i feel like approaching with the mentality of 'straight until proven otherwise' in regards to characters like john & jane & roxy is kind of eeeeeh but i guess its whatever you want to believe. wouldn't agree with calling their straightness 'canon' though, as its never confirmed.

There’s canon evidence behind John and Jane being straight tho and yes they could grow and figure out that they weren’t but based on the evidence presented, canonically they’re likely straight

But, here’s the main point I really want to get across:

I DON’T CARE AT ALL ABOUT WHAT YOU WANT TO BELIEVE OR HEADCANON, IF YOU WANT JOHN TO BE GAY OR JANE TO BE A TRANS LESBIAN THAT’S FINE YOU DO YOU. IT’S ALL MADE UP, WHAT’S CANON DOESN’T MATTER WHEN IT COMES TO YOUR SHIPS, HEADCANONS OR WHATEVER.