These characters can be recruited by triggering an EVENT within the base using EXPLORE command from one of your character:

Effect - Code

Borgon - Galhara Region, Lusone Town
Elena - Runedell Region, Recruiter
Gatrei - Galhara Region, Look Out Post 2 Tower
Lululala - Cook Road Region, Kahd Star Base
Marmilla - Galhara Region, Magician's Grave Tower
Sicily - Judeon Region, Bavalosk Town
Sylvia - Galhara Region, Look Out Post 2 Tower
Taerdus - Alkina Region, Jeumona Star Base
Valoza - Wautuck Region, Derikine Star Base
Xena - Dorand Region, Bateur Star Base
Zio - Dorand Region, Bateur Star Base