Counter angle
Countering Senna is not only about buying anti-heal or running at her. The most important thing is breaking her rhythm: stopping her from collecting Mist for free, forcing her back before she places vision, and making her spend E or R defensively before the real fight. The champions already present in the data show this clearly: hooks like Blitzcrank, Nautilus, or Pyke punish her straight-line positioning, while Leona, Rakan, Morgana, or Thresh threaten her placement and peel timings. Senna wins when she repeats small safe actions; she loses when every action becomes a risk.