Several community repositories provide comprehensive packs ranging from "legit" level 80+ characters to "overpowered" (OP) testing builds. P3N9U1N’s Single Player Collection : A popular GitHub repository
The safest sources are:
These files feature fully leveled characters (Sorc, Barb, Paladin, etc.) with maximized stats, all quests completed, and optimal "BiS" (Best-in-Slot) gear inventories. Why they are the best: diablo 2 lod character save files best