Not only people that want to make hacks, but any kind of fangame. Just because the site is predominantly dedicated to ROM hacking does not invalidate people that want to dive into SRPG Studio, Tactile, Lex Talionis, etc., and ideas for such weapons would be just as valid and useful there as in ROM hacking and, in some cases, might even be easier to implement with a high-level programming language instead of dealing in assembly.
Most of my more interesting weapon ideas end up on magic, simply because I feel like they should be the items that have more interesting effects, not only because vanilla FE often sees to making them as boring as possible but because they’re magic after all.
But, here are a few ideas, either directly from or inspired by other ideas I have written down in my folders for project ideas:
A mace (axe) that is Fire-elemental (targets Res) and can be used as an item as a Torch.
A “punching dagger”-like sword that grants Knock Back but hampers the unit’s Evasion.
A Lance/Halberd type of weapon that is x3 effective versus flying enemies when used by a flying unit OR when a non-flying unit counterattacks a flying unit.
A Crossbow that deals penetrative damage to its target (ignores some percentage of defense) and also deals “splash” damage (equal to the weapon’s Mt?) if there is an enemy directly behind the target.
A Fire tome that grants Seal Defense to the unit, lowering the enemy’s Def after combat. (Being burned by the fire.)
A Wind tome that reduces enemy Hit when being attacked, with a higher drop in Hit for ranged attacks.
A Light tome that grants Despoil and +10 Luck, but is very weak. (Give it a recolored Goddess Icon but in gold as its icon, instead of an actual tome icon?)
A Dark tome that always hits and, if the target would have rolled to avoid the attack, one that doubles its Mt when dealing damage.
A staff that, after healing, grants the target Miracle until the start of their next turn.