banderillero
noun
ban·de·ri·lle·ro ˌban-də-(ˌ)rē(l)-ˈyer-(ˌ)ō 
plural banderilleros
: a person who thrusts in the banderillas in a bullfight
Example Sentences
Recent Examples on the Web Or Ernesto Sobrino, a Spanish bullfighter performing as a banderillero, one of the old men of the ring whose high-risk vocation is to make the bullfighter look good. 
Roger Lowenstein, WSJ, 27 Aug. 2020
Roger Lowenstein, WSJ, 27 Aug. 2020 Word History
Etymology
borrowed from Spanish, from banderilla banderilla + -ero, going back to Latin -ārius -er entry 2
First Known Use
1789, in the meaning defined above