One interesting Beastar fanfic could be about a new character who is a hybrid of two different species trying to find their place in the Beastar world. This character might face unique challenges and form unexpected friendships.
Haru does love Legosi in the manga. It's evident in the way she cares for him, shows concern, and their shared experiences strengthen their bond, making it clear that her emotions towards him are those of love.
First, know the Beastar world well. Read the original manga or watch the anime. Understand the rules, the relationships between different species, and the overall themes. Then, come up with an original idea. It could be a new adventure for the existing characters or a story from a different perspective.
Sure, Legosi and Haru do get together in the manga. Their relationship develops over time, facing various challenges but ultimately finding their way to each other.