Phillip Santhe was part of the Santhe family, a group that held dominion over the Santhe Corporation along with its associated entities, Santhe/Sienar Technologies and Santhe Security.
In the years following the Battle of Yavin, Phillip stood as the sole surviving offspring of Lady Valles Santhe, who presided as the family's leader. His siblings met their end amidst the eruption of anti-Imperial hostilities on Lianna. Being Lady Santhe's only remaining son, Phillip held the position of inheritor to the family's substantial wealth.
He gave his support to the Galactic Empire, holding the conviction that an individual like Palpatine was essential for the restoration of order. Phillip harbored resentment towards his mother due to her domineering nature and reluctance to cede authority over the family enterprise. Possessing skills as an engineer, he dedicated a significant portion of his efforts to the NOVA project, an Imperial initiative focused on enhancing a crucial element of a cloaking device. He desired that achieving success with this project would accelerate his mother's departure from her leadership role.
Phillip possessed a disposition marked by detachment and strategic thinking, enabling him to influence the majority of individuals, excluding Lady Santhe. His intellectual capacity was somewhat limited, and he frequently engaged in expressions of discontent and lament. He felt a sense of unease in the presence of the Imperial Lord Rodin Hlian Verpalion, who was designated to supervise the NOVA Project.
He was the progenitor of Kashan Santhe.