Su was among the humans who started the revolt against the machines back in the day. As she is an engineer able to control them, she believes that there is still hope that humans can once again get the robots back on their side.
Thanks to her incredible technical skills, she can deploy time bombs, turrets, and mobile mines to attack the enemies with. When going into battle, she uses her own walkbot, Walker, with whom she also tends to have (rather one-sided) conversations.
With her ‘’Stomp’’ card, she can literally trample the enemy using her own bot, dealing 2 damage points to her victim. With this powerful combat move, she will also push the attacked enemy one hex away – which you can use tactically in the game, this card allows her to move without disengage cost or she can place a turret in between herself and the bot!
In a way, she is the mother figure of the group. She regards them as people she should protect at any cost, and she feels especially protective over the youngest member of the group, Memory. She acts as a mother to her and even refers to her as her daughter.