The first of the Witch From Mercury High Grade kits I'm going to talk about - Chuchu's Demi Trainer. In keeping with its pilot's approach to conflict resolution (usually violence) it has more weaponry than the standard version of the Demi Trainer.
In keeping with my experience of other Witch From Mercury kits, I think Bandai have perfected the approach that they're taking with more recent HG kits and so the model is easy to assemble and quite nicely designed, though on this one specifically it can be a bit awkward to get the hands to grip the rifle due to the way that the gun's waist mount can be moved. A lot of the general assembly is similar to other WFM models but without losing their differing appearances, which definitely helps with ease of assembly.
It has a nice range of movement with some nifty joints to match the movements that you'd want, and (as I've found with most of the WFM kits so far, actually) the joints are decently solid and it feels quite nice to pose. It also has a good range of movement in the hips, ankles, and shoulders which I'd usually expect to be a bit more restricted due to the chunky armour, which is rather nice although I do find I can never quite line the feet up to be flat on whatever surface I've stood it on.