The Ultra Beasts are powerful and dangerous villains for the most part, and were the Main villains of the Double Universe arc until Hank Hill took over
Ultra Beasts[]
UB-01: Lillie
The only heroic Ultra Beast
UB-02: May
The most destructive Ultra Beast and the only currently active one
UB-03: Hau
UB-04 and UB-05: Danny's unnamed friends