Leaders

A leader unit is the head of its party.
You can select one leader unit per party.

From the Manage Party screen, tap on a non-leader unit and then tap the Set as Leader button to set that unit as the leader.
Units selected as leaders cannot be removed from a party.

When a team other than the one labeled companion in blue is selected, the party leader from the home screen will be displayed in player information.

When selecting your companion party, it is possible to choose which unit will be used as your companion, and the player you choose will be shown in your player information.
If they use it, you will obtain friend points.