Depending on which version of Eastern Sun (ES) you are playing, your character saves are stored in different locations:
Master Guide: Diablo 2 Eastern Sun Character Saves is a legendary modification that overhauls Blizzard’s classic action RPG with thousands of new items, skills, and mechanics. Because the mod is significantly more complex than the base game—featuring over 240 new rune words and a level cap of 110 in its "Resurrected" version—managing your character saves is vital for protecting your progress or testing high-level builds. Where to Find Your Eastern Sun Save Files Diablo 2 Eastern Sun Character Saves
Moving saves is a common way to "hero edit" or share powerful builds with the community. Diablo 2 Eastern Sun Character Saves - - Ultra Tower Depending on which version of Eastern Sun (ES)