Observable kinematics of TNG-Cluster halos: line-of-sight velocity (left) and velocity dispersion (right) as a function of the halo mass. Each dot corresponds to a halo, with the color representing the halocentric distance at which the velocity is measured. Lines show running medians. The big square and big diamond correspond to the Hitomi measurements of the velocity dispersion of the core of the Perseus cluster (Hitomi Collaboration 2018). Velocity dispersion increases rapidly for more massive halos, while the annular averaged line of sight velocities remain near zero on average, as expected. At the same time, there is significant diversity i.e., large scatter across the sample.