A free mod for Mount & Blade II: Bannerlord, by Apastron152e9.

This mod is a set of add-ons that change the appearance of your units in the game. For each unit type, there are several different banners to choose from. In the case of units that do not use shields, the banner is added to the slot for the equipment. For units with shields, the banner is displayed on the shield, and if the unit does not use shields, then the banner is displayed on the first, second, third or 4th slot in the inventory.

The installation process is very simple.