Ah, the majority of my favourite weapons have to be from the Fire Emblem games! In fact, I'll share a list of my favourite weapons, and any other weapons that I haven't used, but, I'm quite interested in them!
Hm, first there's the Ragneel from Fire Emblem Path of Radiance, Radiant Dawn, and it made a cameo appearance in Fire Emblem Awakening. Hooray for magical swords! Well, it's technically a sword that's been submerged in a lot of magical energy, in which I think only few are allowed to wield it. It's a pretty nice item because it allows Ike to get a really great skill and defense stat boost, in which he will always have a high percentage on hitting enemies. @_@ They changed it up in Awakening, where anyone who has a good sword level is allowed to wield it now, and I thiiink it gives a Def boost? But, it's pretty funny to wield it with characters like Olivia. :3
I always like using the Nosferatu tome in the Fire Emblem games too. Well, in the earlier games, it had a low hit percentage and a somewhat-low power rating, but, it became useful for Shamans who were a liiiittle weak on HP, so, the enemies won't be able to beat them in one or two skirmishes (ie Knoll in the Desert almost dies most of the time without it ugh). It got powered up in Fire Emblem Awakening which they really buffed up it's power and move percentage. I think. It became really broken on characters like Sorcerer!Morgan, who never, ever dies with that. ;v;
I've always had a soft spot on using the Brave weaponry from the Fire Emblem games too; like Brave Swords, Brave Axes, Brave Lances, etc. They're pretty handy to have - it allows the character to attack more than once! So, take a fast character who can attack twice in a battle already, let him have, say, a Brave Sword, and they can attack four times in a single battle! It really, really helped a lot in really tough battles, like Apothesis in Fire Emblem Awakening, and the secret levels in Fire Emblem: Sword of Seals, since every enemies' attack and defense were... amazing, so, you'd have to take them out quickly before they grouped together. @_@