I'm sure that you have found out by now his personality. I have raised Hamburgs and Hamburg crosses for more than 40 years and have never had an agressive Hamburg roo. They have always been great with the ladies, and super respectful of me and other humans. (However, I would never have more than one rooster as they will fight to the death if confined together).
Although considered flighty and independent, I love their wild-like personalities and non-broodiness. I have Fayoumi/Hamburg/barred rock hens now (and one Ancona who is splash black and white). The small mixed flock is about 90 percent Hamburg, and all are spectacularly marked. Spangles with some barring on wings. My purebred Hamburg (unrelated to my ladies) roo has a full comb instead of a rose comb, but his offspring have rose combs.
I've also had experience with a lot of other breeds (brown leghorns, golden penciled Hamburg, partridge rocks, white rocks, barred rocks, Sussex, etc) and the Hamburgs have remained my favorite. I live in Montana and the rose comb is perfect for winter. The birds have all been super hardy and healthy too. They eat less than larger breeds, give more eggs than many breeds, and are so darn pretty and lively. I usually keep a flock of four or five hens and a roo, but have eight hens and a roo now due to three pullets hatched this year from the Ancona (not her eggs, but the Hamburg crosses). Ever so often a Hamburg will go broody (once ever couple of years) and that has worked out perfectly to keep my flock going all these years without having to purchase any chicks.
By the way, Hamburg DNA has put them as originating as a breed in Croatia, not N. Europe, where they were refined.