Apart from the Hades cabin guys, Mustermann is surely the one most connected to hell, as he is an attorney. And a demigod, German and a son of Hypnos. Created on (enter date) by Ryszard(R) (now the Prosecuting attorney) accepted on the same day by (I think Percabethforever2511, check later).
The original idea of him being an heartless criminal went pretty much to hell. Now he is an odd dressing lawyer, whose plans can often be considered violent. He is 14.
Mustermann usually takes formality to extreme lengths (most recent: Threatening a god to punish him for calling Mustermann by his first name.). Usually, he is encountered wearing a white shirt, black tie and a black suit coat. He is paranoid or violent at times, however usually he is nice to people.
He usually carries two weapons: A Walther PPK (James Bonds pistol) and a AK47/Mossin Nagant bolt action rifle (though he carries the Mossin Nagant more often) depending on the situation. If a fight awaits him, he also takes a Radon RAK Wzor 64 machine pistol. But he also keeps a good arsenal of revolvers and other weapons. He may need a quick time replacement... which is convenient placed under his sister's bed in the Aphrodite cabin (a goddess who he once tried to sue and then shot with a rocket launcher (long story...).
I have enough firepower to fund a small separatist uprising! (on surviving)
Want to sue a goddess? We will do it! (Most of our cases are insane anyways) (on his profile of his law office Mmn&Associates Law offices, which consists of Mmn alone.)
I can give him a Pfeiffer Zeliska .600 revolver (on learning someone hates everyone) (the revolver is the size of a rifle and weighs 13 kg (around 26 pounds) when loaded)
The name "Richard Mustermann" comes from Max Mustermann" who literally translated is "Max Doe", but is the equivalent of "John Doe". After doing some heavy math Richard Mustermann introduces himself as "Richard Doe".
His true name is unknown. It is just sue it isn't Mustermann. After all, no American is named "Doe"