Alice

Enigmatic, serious and driven, Alice was the first Prototype whom the original Arcadius allowed into PACT's ranks after she ended up stranded in PACT space escaping from Diode during the events of the Diode Catastrophe, six years prior to the Alliance-PACT War. 

She identified herself as being the Prototype who was responsible for taking up Arcadius' name, yet also denotes that she was simply the "last" person to claim it, showing she does not consider the other Prototypes who serve as "Arcadius" to be more then extensions of herself.