There are basically 3 ways you can transfer items to another character you've made. It's quite helpful for those who needs help transferring items to other characters if they're useless to you in your original class.
1.) Create a Party, set the game type Normal and choose any difficulty. Now go to the bank and you should able to see another bank lady on your left. Speak to her and you'll see that it will have no money and no items in that spot. It's actually a special bank that allows you to have other characters of yours pick items from what you deposited. Such as your HUNTER deposited a GUN and your RANGER can pick it up and use it since HUNTER can't use them.
2.) Have someone you can trust with, then begin the transfer. Drop items and have them pick them hold them on for you. Ask your partner to wait in the same Party you made and come back with a different character. Then tell them it's you and get your items what you needed.
3.) You can also do this with a partner by using the TRADE WINDOW, they're not actually keeping them while traded and plus during that you don't need the required items to do this just "NO ITEMS" and proceed. Come back with a different character and get your items back by doing TRADE WINDOW again. And there you have it, your precious items.
That's all you need to know about transferring items to another character you have. You can only have maximum of 4 characters with different class and name. Because all class with different names and classes you will get a different ID SECTION that allows you to find specific rare item.