I scoured all the clues on the wiki; the results aren't great, but I can summarize my findings. Basically, there are practically no mayors of cities starting with M who ruled for 16 or more years, other than Luzhkov. So most likely, that's where we need to dig. The only thing mentioned on his page for 1994 (16 years before resignation) is the establishment of Teleexpo. But I didn't really get anywhere from there. At the Nuremberg trials, Baldur von Schirach and Albert Speer were given 20 years. It's a dead end with the first one, but with the second, there are so many various links that I just gave up.
The clue for the maniac turned out funny — it ties to Gur very easily and quickly, but he couldn't have killed himself... :o Generally, I had more luck here; I found the following chain:
The Elder Scrolls Online - ZeniMax Online Studios - Mythic Entertainment - BioWare - Eclipse Engine
However, there's a problem with the feedback loop — you can go from ZeniMax to Mythic, but not back. Also, as for the words "Exp. Univ.", if they relate to this somehow, I don't understand how. Nevertheless, I still consider Shaman the maniac based on behavior.
As for Armenians born in Moscow on June 5 — I went through the wiki list of people born on that day (not all of them, of course; I only checked those with Armenian surnames) and found these two:
https://ru.wikipedia.org/wiki/%D0%9A%D0%B0%D0%B2%D0%B0%D0%BB%D0%B5%D1%80%D1%8F%D0%BD,_%D0%9A%D0%B0%D1%80%D0%B5%D0%B0_%D0%90%D1%80%D1%82%D0%B0%D0%B2%D0%B0%D0%B7%D0%B4%D0%BE%D0%B2%D0%B8%D1%87
https://ru.wikipedia.org/wiki/%D0%9C%D0%B8%D0%BA%D0%BE%D1%8F%D0%BD,_%D0%A1%D0%B5%D1%80%D0%B3%D0%BE_%D0%90%D0%BD%D0%B0%D1%81%D1%82%D0%B0%D1%81%D0%BE%D0%B2%D0%B8%D1%87
Both personalities are quite strange; I have no idea how to get from them to games.
Anyway, that's it. For now, my vote is — execute Master.
Added after 1 minute
Oh my god, what's up with the links?