Mr Porrima was a customer of the Bank of Karabraxos. He once met the Twelfth Doctor, who took a sample of his DNA by shaking his hand so that Saibra could replicate his biology and infiltrate the bank along with the Doctor, Clara Oswald, and Psi. (TV: Time Heist)
Behind the scenes
Mr Porrima's name was not given on-screen, only in the credits.