I know I may be a little late to this thread, but I think a good name for A-Pewter + F-Iron would be "Bouncer". The name evokes that similar strongman vibe that "Thug" or "Brute" does, and it also works as a bit of a double-entendre.
When a "Bouncer" taps their stored weight alongside burning their pewter, they become like an immovable object, perfect for keeping people from getting past them, which is also perfect for the position of a professional bouncer at a club or bar. Tapping a large amount of weight just before a strike could also drastically increase the impact force of an already pewter-enhanced punch or kick.
Additionally, when a "Bouncer" stores their weight they become much lighter, and in combination with the increased strength from burning pewter, they could easily leap great heights/lengths and fall safely, while remaining incredibly maneuverable thanks to pewter's enhanced balance. This makes them, in a way, almost literally "bouncy", as they leap between streets, walls, ledges, rooftops, balconies and more.
