Quoted By:
I'm personally of the idea UBs take the appearance of the first person they meet and that you cannot catch them, but imagine this for a second:
>UBs are actually disguised as humans
>UB-01 and 02 are actually Lillie and Lusamine
>You can catch UBs
>You can play with UBs in Amie
>You can turn UBs into their human forms in Amie
