My flower bunny had bro and cheerful traits .. was an adult but it didn't show any other unknown traits so that was kind of weird. I love that they don't talk it's kind of like when you see fully costumed characters like Mickey an Minnie in Disney World they don't talk they just gesture. It makes sense to me anyway.
Oh mine showed up and was standing down the street a bit I had a sim run up to engage it and did the "chat here" to get it to come to the house. It might have come on it's own but I didn't want to wait.