Tusk is Polish, specifically the northern coastal city of Gdansk. He has ancestry which is German and Kashub. His gestalt is sanguine, but he doesn't smile too often. He is a fan of long distance running: https://twitter.com/eucopresident/status/1000750678183161856/photo/1
He is about 5" 7 (1.74m) in height, a little under Poland's national average. He is a divisive figure in Poland for pro-EU, pro-market and privatization reforms; his social positions (abortion, gay rights, free speech) are moderate, which upset both trenchant traditionalists and reformists in the country.
A relaxed interview in Tusk's native language reveals an affable, essentially optimistic but determined official with a moderately loud voice. Good eye contact and fluent, non-faltering speech indicate absence of A- trait. Gestures are infrequent and restrained.
I propose that Tusk is an NPA type of moderate temperament, with N or NP lesser possibilities.
Semi-off topic: I will post a habitancy report on Poland around July.