If you haven't heard of it, you might like
Censored for Betas. It has a few character that share some similarities with Susan/Hellen.
IMO I honestly didn't like either Hellen or Susan, but I agree that they were the most well put together characters/storylines when it came to SPH, they were just too extreme/didn't mesh with my tastes.
Tina and Clara I get what you mean, though I thought Clara had the funniest lines/moments in the game, second to the Cheetah "joke" route (I actually kinda liked that route too.)
Clara was a very stock Yandere archetype beyond that and it doesn't really do much with the premise because of how disconnected the game is.
Tina felt a bit all over the place the way the scenario was set up. Though I can at least say it was one of more original SPH scenarios I've seen, if that amounts to anything.