Neptunia games I always take Vert and Uni. In the first two it was Vert, Uni, Neptune, and Rom. Third game was Vert, Uni, Neptune, and Plutia. In the last game it was Vert, Uni, C-Sha, and Rom.

VI: Celes, Sabin, Terra, Cyan
VII: Cloud, Yuffie, Cid
VIII: Squall, Quistis, Rinoa
IX: Zidane, Quina, Steiner, Vivi
X: Rikku, Wakka, Yuna
XII: Ashe, Penalo, Balthier
XIII: Fang, Lightning, Hope
Type-0: Cater, Duece, Cinque

P3: Mitsuru, Akihiko, Aigis
P4: Yukiko, Chie, Kanji

Xenoblade: Melia, Shulk, Seven

Tales of Phantasia: Suzu, Arche, Mint, Claus
Eternia: Reid, Farah, Meredy, Keele
Symphonia: Sheena, Colette, Raine, Genis
Legendia: Chloe, Grune, Norma, Moses
Abyss: Natalia, Guy, Tear, Jade
Hearts: Ines, Beryl, Hisui, Kohaku
Graces: Asbel, Sophie, Cheria, Pascal