Foyo Vedrashimeen was a Time Lord who worked at the Academy as a researcher. He escorted the young Master to the caldera to look into the Untempered Schism.
Later in life, he travelled the universe in his TARDIS collecting data regarding exploding planets. He preferred the permanence of paper, so he filled his TARDIS's gallery, observatory, and swimming pool with stacks of data printouts.
While observing a moon that had exploded without any discernable cause, Foyo was poisoned by Missy, and he and his papers were devoured by ravenous insects from the destroyed moon. (PROSE: Tempered)