To get a free Tamayoshi helmet, enter a random battle then win, when it says 'YOURNAME stands victorious' hold down A + C + Up + Start on controller 2. Then press A on controller 1.
Rename Characters
At the name entry screen use all five space to enter your name (eg., BRIAN) then use the FWD button. The screen should change to show another character. Repeat this process until you've named them all.
Weapon Tips
Flails: These weapons arent always the strongest weapon for Milo, but they will ALWAYS attack twice per turn. Unlike the whips, the flail can not only attack more than 1 enemy in the same group, but it can also attack enemies in other groups and hit the same enemy twice on the same turn. The "Great Flail" is the best of the flails and is technically the "best" weapon for Milo to use throughout the game.
Whips: These weapons will attack EVERY enemy in a single group (groups can have up to around 10 monsters each). The best of which is the hex whip, which must be made for Pyra from a Dark Block - it will be cursed, but it's still worth keeping equipped. The curse causes you to be tangled up in the whip AFTER an attack 30% of the time. You will not be able to move for 1 or 2 turns if you get tangled, but this usually doesnt matter because you'll defeat the enemies in the first round of combat anyway.