I'm not sure if Murakumo is upset that she got compared to a rabbit, or that she got compared to a oni?

In the end, they realize it doesn't matter what it may make her resemble, it doesn't mean she's what she resembles as Tatsuta helpfully shows them. No way she's an innocent angel

I actually thought about this too, Tenryuu and Tatsuta's personality is just reverse with their riggings. Like Good Oni and Dark Angel

As if the dev make fun of them with "Don't judge a person with their appearance only"

While Murakumo is taking the "A lonely rabbit will die, but she didnt want to admit it" phrase-like personality