Check your cards to see if you have the Namingway card. You can find this in Kuja's Palace. The Namingway Card is necessary to change the Character's names, but will not be taken away if you do.
If you have the card, proceed to Daguerro to the middle floor. Let a man see it (he will ask about the card). Then you can rename the characters, but only if he can see it.
|Get Excalibur II:
If you can beat the game in less then twelve hours, Steiner will receive his ultimate weapon.
|How to Get Odin Summon::
I did this by buying Dark Matter in the Treno Auction. I don't think there is any other way.
|How to Kill the Undead Tree in the Lifa Tree Roots::
Simply cast life on it, or use Pheonix Down, or Pheonix Pinion.