When the Unite (or Co-op) command is selected during battle, characters cooperate with each other to attack the enemy. There are various attack methods depending on the combination of characters but they are all generally powerful attacks capable of changing the tide of battle.
Unite Attacks are generally not limited by constraints such as MP and so can be used repeatedly in battle. The use of a Unite Attack uses up the turn of all characters who participate in the attack.
Some characters may be affected by a status effect during the attack, limiting their ability to participate in Unite Attacks until it is removed. Unfriendly and Unbalance are two common status effects which prevents the afflicted person from participating in a Unite Attack.
- Genso Suikoden Kiwami Encyclopedia, page 143