Guilty Gear X
The S palette really resembles Mina Majikina of Samurai Shodown fame. The red palette for H is a very popular Millia color palette. It also gets cosplayed quite a bit: Female Japanese player Akira cosplays using this palette and also uses it in game.
Guilty Gear XX
Her Start color is clearly inspired from Elly of Xenogears fame, who is also very hot and wears a similar outfit.
Guilty Gear XX #Reload
Guilty Gear XX Isuka
Guilty Gear XX Slash
Guilty Gear XX Accent Core
In the Accent Core console release, the #R and Slash palettes are just EX colors from their respective games.