It's a nice aircraft - there is a D.VI in the Plat. Ed. of WOFF, by the way. In the right hands (capable pilot) - it may be a more effective aircraft than the famous D.VII. Top speed on the D.VI is around 200-1 kph, so it's not bad at all - faster than the Dr.1 (of any engine variant). There were also engined-up experiments with the D.VI - Siemens-Halske, Oberursel Ur.III, etc. - 145 to about 160 hp - which should give it a fine climb rate and gentle stall characteristics since the same airfoils are used I think that are also on the D.VII. Somewhere in an interview Mikael Carlson mentioned that he would rather take the Dr.1 than a D.VII into a dogfight - perhaps the D.VI is the sweet spot between a twitchy and stable mount.
Here's another looker - the (somewhat obscure) Fokk. D.V:
https://www.cgtrader.com/3d-models/aircraft/historic/fokker-d-v-d-5
EDIT: And another interesting link/post where the Fokk. D.V "geometry" is reconstructed - this should come in handy for any 3-d modelers out there interested in WWI models, both for actual models and in-sim models:
https://airplanes3d.wordpress.com/2019/04/27/recreating-geometry-of-a-forgotten-wwi-fighter/
Happy flying,
Von S