Gunther is a Germanus under the employment of Triumvirate Holdings.
The Trials of Apollo
The Tower of Nero
Using the Oracle of Delphi to know when Apollo and Meg McCaffrey would arrive in New York City, Nero had teams stationed at every port and station within the city. He is part of one of three teams on the Amtrak the two take into the city and apprehends them. However when they cross the state line into New York, Luguselwa escorts the two to the bathroom, in reality helping them escape. When the fighting breaks out he and half a dozen other germani try to break down the door to no success as Apollo unhooks the car from the rest of the train.
He is present when Apollo and Meg surrender, he and another germani restrain Lu when she is revealed to have betrayed Triumvirate Holdings. He drags a severally weakened Lu to the cells and tosses her in. Later he brings her and Apollo lunch as he informs them they are scheduled to be tortured that night. When he returns for them he orders Apollo to tie up both Lu and himself, but they bait him into coming into the cell himself and he slips on a slick of ointment and the prisoners use him as a bridge to escape before the door pins him in place, nearly crushing him.
It is unknown if Gunther survived his severe injuries, particularly with the Germanus being made mortal again shortly thereafter.