>>6537186Pic related is probably the most detailed licensed "knight" minifig, frightening knight is certainly a frontrunner.
I would prefer more historical, but the factions allow them some room to have a nice dissonance between minifigure design.
As for set design the vikings line is a good blueprint if they think it's too soon to retread 2009's fantasy castle, if they go the fantasy route with the next castle line I would love it to be myth/legend inspired.