Velma as lesbian is safe, tame, expected, obvious.
I think originally she was written to be the nerdy, bookish, smart one on the team, and was written to give representation to nerds so they could feel empowerment.
Sexuality for children’s cartoon characters wasn’t a thing. It was taboo. If you drew the Scooby Doo gang naked in the late 60s, they’d look like Barbie and Ken dolls — no genitalia.
Of course it’s fine for humans to be sexual beings, since that’s what we are, and it’s no different with cartoon characters, and if you grow up and you’re still interested in Scooby Doo, and now you want to think about them sexually, go for it.
If you grew up crushing on one of the characters, I’m not going to shame you for it. If there was anyone in the group who appealed to me, it was Velma. You could tell under that thick turtleneck she was hiding an amazing body, and she had a restrained energy about her that was just waiting for its awakening.
If the writing team that’s handling the Scooby Doo property wanted to be bold, making Freddy gay (or bi, what’s wrong with bi?) would definitely be the way to go. Freddy was presented as being the masculine, strong, leader type. Making him a gay or bi character without changing that would be amazing. None of the usual gay stereotyping, but still a hint of it in his ascot.
People *want* Velma to be gay, because they want to watch her doing girl-on-girl porn, the way straight men love their fantasy lesbian porn. But people aren’t ready for Freddy to come out, and that’s exactly why he should.