Legend of Mana Gameplay Details
Seiken Densetsu: The Legend of Mana, perhaps the most anticipated upcoming game of all, will have some new gameplay features that weren't present in its predecessors.
First, there's a monster breeding system. In The Legend of Mana, you'll be able to capture monsters, breed them, and make them join your party as the third character (which is apparently an NPC). The monster will then help you fight during battles.
The Action Ability System allows you to assign different moves to the shoulder buttons of the PSX controller in battle. You can learn new attacks and moves by pressing these buttons in certain combinations. It also appears that combination attacks between multiple characters are possible if the characters in question are standing close enough to the enemy they are attacking.
The Land Make System allows you to place items called artifacts on the world map. This will cause new towns, areas, and dungeons to appear.
I don't know about the rest of you, but I'm getting really excited about Seiken Densetsu: The Legend of Mana. Not only does it look great, these gameplay features sound extremely promising.
Source: Magic Box