bicho raro

Literally, “strange bug”.

bicho raro m (plural bichos raros)

1. (idiomatic, colloquial) freak, oddball, weirdo
   • 2021 December 8, Carlos Marcos, “Marilyn Manson: la caída al infierno del fantoche del rock”, in El País‎^[1]:

     Celebrado como provocador bicho raro, el músico vive una decadencia musical y personal después de las denuncias de acoso sexual de algunas de sus exparejas

     Having been acclaimed as a provocateur and weirdo, the musician [Marylin Manson] lives in musical and personal decline following the accusations of sexual harassment from some of his ex-partners

• “bicho raro”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.7, Royal Spanish Academy [Spanish: Real Academia Española], 2023 November 28