To Try Help you make your choice

History shows some clear evidence of the differences in warriors between lands and regions. In General with your height I would stay away from ALL Strength class characters, The Strongest characters in For Honor are notably the Tallest and strongest, logically, this Will Rule already rule out all of the Viking's, with MAYBE the exception of the Berserker, because of his agility and speed making him the smallest of the 4.
From the Samurai, here you have more of a choice. Their culture and genetic traits from the time generally keep their height from being above your 181cm range. However in For Honor, for balance ofc two characters will stand out as the taller more Powerful from the 4. So I would stay away from the Shugoki and Kensei, giving you two options here of Orochi and Nobushi.
From the Knights there is only one obvious choice and that is the Peace Keeper. The other 3 characters clearly show Core Strength and Power wielding heavy armor and Weapons, Not a feat achieved by smaller men or women in the time period.
Hope this helps, and that the 3 characters suggested Nobushi, Orochi or Peace keeper, will bring you JOY.