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.
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.
One common theme is friendship. Given their different species in the Beastars world, their friendship is often explored. For instance, how they support each other despite the initial prejudices. Another theme could be growth. They both grow as individuals, and their relationship helps in that process. For example, Haru might help Legosi become more confident in his own skin, and Legosi might teach Haru about the importance of self - defense in their dangerous world.
Some official Beastars - related forums also have sections for fan - made content. There, you can find non - mature Legosi x Haru fanfictions. These might explore their relationship in a more platonic way, like how they learn from each other's different species' cultures and values.