>>13914512A lot of the backstory is meant to be found throughout the story in ruins and stuff.
Also, the idea is that the archaeologist has Eronze and is disheveled and not very put together well, similar to Eronze.
The CEO type is about efficiency and modernity and industry, so he utilizes Erace, as both are sleek and smooth.
The Mercenary gets Erion because both his design and Erion are abominations of sorts and Erion, being the bulkiest of the golems, draws perceptions of brute force. Also, the poison typing of Erion fits the toxic personality of the Mercenary the best