Board Thread:Dark Assembly/@comment-294304-20150401001304/@comment-294304-20150401040101

Their official profiles. Usually, those are just on official sites or in artbooks, but as of D3, there is a NPC who has access to them for the classes you've unlocked (among other things).

As for the Armor Knights: Both are graduates of the Knight's Academy, where they are taught fighting and etiquette, and are granted their armor and assigned a noble to serve upon graduation. The female's profile even makes explicit note that the females rapidly increased in number and now outnumber the men (which seems to be a lampshade hanging).

I haven't played DD2, but going by what the wiki has up they fill the exact same gameplay niche (right down to sharing at least one Evility) of the slow yet sturdy tank unit.