Distributions of key merger history metrics for MaNGIA galaxies, separated by ex situ slope class. Top: Mean lookback time of mergers, weighted by the stellar mass of the secondary progenitors, reflecting when most mergers occurred. Second row: Mean cold gas fraction of merging companions, weighted by their stellar mass, indicating the typical gas richness of the merger history. Third row: Mean stellar mass ratio of mergers, also weighted by secondary progenitor mass, characterizing the relative strength of merger events. Bottom: Fraction of major mergers, calculated as the number of major mergers divided by the total number of major and minor mergers over the last 2 Gyr, highlighting the dominance of major versus minor mergers in recent assembly history.