Morphology of individual mergers at the time of accretion for the five most significant events, for each M31/MW analogues in HESTIA. The merger accretion lookback time (Gyr), total stellar mass of the merger debris at the time of the merger (log₁₀(M_*/M_⊙)), and the stellar mass ratio (μ_*) relative to the main M31/MW progenitor at the time of the merger are given at the bottom of each panel. The colour bar represents stellar density, in units of M_*/kpc². The merger debris show diverse morphologies, likely caused by the different trajectories of accreting systems and internal mass/kinematics distributions.