Hey-o! Along the same lines as Vivi the Black's post above, I went through the Knight character concept and made a few additional changes to my PF attempt at replicating Steiner (toon name= Augustus Eldridge).
Using the drawback system from Ultimate Campaign, the Attachment Drawback was added, specifically to mimic Steiner's loyalty to Garnet and his unyielding protection of her. Because of the use of this drawback, the ability to access a third trait was added (per Ultimate Campaign). Along with the addition of this third trait, the previously selected traits were reworked a bit in order to add diplomacy as a class skill and bump up its ranks a bit.
Hopefully this isn't a terrible build for Steiner :)
(this is Acre)