Most forward facing knee jointed mechs are humanoid, and most reverse knee joint (Chicken-Walkers) have a horizontally orientated torso (sort of aircraft fuselage shaped torso) to them. However, I feel we can't forget about our Humanoid/Chicken-Walker hybrids too.
Mechs like the Cataphract are an amazing example of a Humanoid body/Chcken-Walker legs. Such an ugly thing of beauty .
Or, the Jenner is an example of the other way around, with it having Humanoid legs/horizontal orientated torso. I'm less of a fan of this config, but the Jenner is definitely timeless.
With all the different mech models I'm sure Paradox has plenty of DLC opportunities