Here’s a simple price of concept art showing how the royal guards' armor will look in mlha, everything is to scale with the figure. They'll make quite a few appearances in the series, this also shows the various weapons they use. Note that this represents only one type of guard, there's many regiments and units, so certain armor or weapons may vary depending on the type of guard. Not all the weapons they use are shown here. this is just the basic kit that a standard foot soldier would carry. The rifle is most likely going to be resigned, it doesn't fit in aesthetically.
Actually, looking back at the way I drew the helmets center nose piece, it's a bit warped. I didn't intend for it to look this way.