Bear Geki is a B-rank control unit with a stun-focused kit that scales off his own HP percentage. He is mostly a collection piece with very limited practical value, even for beginners, as B-rank units lack the stats and efficiency of A-rank alternatives and fall further behind in any serious progression.
At max skill levels, his stun pressure comes from Hanging Bear, which combines a moderate base chance with conditional HP-threshold scaling for additional stun rate. Bearlike Body adds extra stun chance against enemies that have not yet attacked him, creating possible early-turn control. However, his very low speed and mediocre physical damage mean he struggles to land reliable pressure, and even when stun procs occur, his overall impact remains minimal compared with higher-tier controllers.
Overall, Bear Geki is purely a collection/nostalgia unit with almost no practical use case, even if Stun is a nice kind of control, is just Geki don’t have the kit to make it work.