Roman is a trans man and has taken testosterone as well as been through top surgery. Upon his full admittance to H.A.U.N.T. the medical team made up of flesh-shaping witches that are responsible for tending to agents aided him in his full transition to his liking. this includes advanced gender reassignment surgery via magic (because if you have magic, why are you not using it for the good of the people, really) thus deferring the need for continued use of testosterone and altering his body to his liking in general including sexual organs.

He has voluntarily kept his top surgery scars because he doesn't mind them, they are extremely faint from years of care, but people who get close enough to him (re: sexual partners) will be able to see them/faintly feel them.