Of the three members of Celestial Sphere, Shia is the soft-spoken and kind-hearted of the bunch. Like her brother, she harbors a love of Gunpla, though hers is a bit different in that she can seemingly understand the feelings of another person's Gunpla to the point where she will refuse to destroy well-made works in battle unless forced to. She is also not as competitive as her fellow teammates as shown in the battle with Team Nemesis where she proposed to run the clock against Lucas Kankaansyrjä while Wilfrid and Saga instead wanted a "complete victory" by defeating the last one remaining.

Shia has an affinity towards strong people and sees great potential and skill in Sekai Kamiki, quickly becoming romantically inclined towards him while occasionally having private talks with him. Despite the possibility of fighting his team in the tournament, Shia chose to personally help Sekai improve his Gunpla, walking him through each step and later helps to give it another upgrade after the tournament. She also stood up for him when Team SD-R tried to intimidate him before their upcoming match.