Since the start of the game, the trading system has been pretty tight and you can’t just transfer items from one character to another. Thankfully, the team storage has been implemented. But it is limited to non-“untradable” items such as quest and event reward items and items that are traded to a player by non-premium user.
My suggestion is to change the status of untradable items to account bounded item, items that you get from events and traded from a non-premium user, and character bounded, items that you get from quests, since people tend to re-roll characters from time to time due to the fact that this game requires certain builds to become viable and buffs/nerfs often happen.
I hope to get a positive reaction from this and hope this gets implemented. 