My favorite signature weapon for an entire series (a weapon that represents the series): The Sol Blade in Golden Sun
For a specific character: Link's hookshot. That's right folks. I love being able to whip it out, point it at something, find the one pixel of wood on it, and then teleport there. Also it functions as a great stun weapon.
Come to think of it, I'm also a really big fan of the snake-whip from the Indiana Jones dungeon in Spirit Tracks. That thing is amazing for keeping enemies at bay and it has just the right crack to let you know that enemies are hurting.
For a specific character: Link's hookshot. That's right folks. I love being able to whip it out, point it at something, find the one pixel of wood on it, and then teleport there. Also it functions as a great stun weapon.
Come to think of it, I'm also a really big fan of the snake-whip from the Indiana Jones dungeon in Spirit Tracks. That thing is amazing for keeping enemies at bay and it has just the right crack to let you know that enemies are hurting.