::Radiata Knights Humans::

Patrick-Location: Radiata Castle Dungeon 

     Talk to him just after he wakes up in the evening.

Putt-Location: Radiata Castle Dungeon

    Talk to him while he is asleep in the evening.

Dynas (Friend's list only)-Location: Wind Valley 

    Fight the Wind Dragon with an open spot in your party.

Natalie-Location: Radiata Castle

    Talk to her after the battle at the Radiata gates.

Nina-Location: Radiata Castle Training Room

    Talk to her and fight her in the early afternoon. Do this on two separate days after 
Dynas allows you back into the Knights.

Leonard-Location: Radiata Castle Basement

     Talk to him with Natalie in your party.

Gawain-(Non-Human path)Location: Goblin Haven on the 2nd Floor

    He'll join you automatically at first. After the Fire Mountain quest, talk to him to fight
him and win.

Charlie-Location: Radiata Castle Training Room

      Talk to him in the morning after Dynas allows you back into the Knights.