I'm not aware of any show named 'Crunchyroll My Love Story' on Crunchyroll. It could be a fan - made title or something that is not an official show on the platform.
Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.
No, not all of the manga on Crunchyroll is free. They have a mix of free and premium content. The free part might have limited chapters or series, while subscribing gives you access to a wider range.
Some manga can be found on Crunchyroll. However, it's not a comprehensive manga library. You might have better luck with dedicated manga apps or websites for a wider range of choices.