As you already know, this is the “Boosted gear” being the Protagonist's Longinus category Sacred gear.
As it is the first time that I make a lora on an armor it can have its mistakes, one of them is that it always makes the same pose most of the options (depending on the promt of course) and I don't believe keyword to make a character and only generate the gauntlet. This is experimenting for now.
The good side is that if you remove “helmet” from the promt and place character specs, it generates image of that character without the helmet and armor on (As was the case of Rias Gremory). Finally the model is flexible enough to have a more feminine approach by lowering the strength to 0.7 or 0.6.
And as I always say. Enjoy and be as creative as you want