Assuming both characters are on the same account. The best way to transfer AD is via the exchange interface.
Simply open the window. Offer to buy Zen for a unit price that you know wont sell, like 50. Then set the amount of Zen you want to buy, equal to the amount of AD you want to trade. For example, if you wanted to trade 100,000 AD. Set the unit price to 50, and the Zen to buy at 2000. Then post the offer.
Your 100,000 AD will then move to the listing tab. You can then cancel the offer. Your AD will then remain in the exchange as an unclaimed balance.
You can then switch to any character on your account. Open the exchange window and withdraw that balance. This method lets you transfer AD at will, with zero cost or tax.
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Simply open the window. Offer to buy Zen for a unit price that you know wont sell, like 50. Then set the amount of Zen you want to buy, equal to the amount of AD you want to trade. For example, if you wanted to trade 100,000 AD. Set the unit price to 50, and the Zen to buy at 2000. Then post the offer.
Your 100,000 AD will then move to the listing tab. You can then cancel the offer. Your AD will then remain in the exchange as an unclaimed balance.
You can then switch to any character on your account. Open the exchange window and withdraw that balance. This method lets you transfer AD at will, with zero cost or tax.