Hello..
Over the years, I noticed an enhancement for players with multiple characters, i.e. exchange of r/ex gear on the same account. When I first started playing this game, my brothers created characters all on the same account. If there is evidence of the same ownership of both accounts, then those characters should be able to be transferred.
I know there are concerns of RMT, but there are several ways to combat that.
1. Both accounts must have the same owner (i.e., same credit card information)
2. There's a hefty fee (i.e. $50) per transfer
3. Each account can only do one transfer per quarter
4. Each account can send and/or receive ONE character per transfer
5. Each account must be active for 90 days before being eligible for a transfer.
I haven't played in a few months, so I'm not sure if this has been implemented already. I also posted this comment in so many different FFXI forums, I'm not sure if this was already addressed.