Oh yeah, I forgot. I've only really played SD3. I started on Legend of Mana and Secret of Mana, but they didn't suck me in the same way that SD3 did.

Character and weapon? I like Lise and her spears.
Mana spirit? Undine, although a Luna is fine too.
Cannons are way cool, but Flammie is way cooler, and the music is awesome too.
I haven't played them all, but I have at least started most of them, even if I didn't finish most of them.