The Phantasy Star Portable games (Based on Phantasy Star Universe) for PSP have such a feature, which is called "shared storage". You can have up to 4 characters and all of them have access to that shared storage while at the equivalent of "mog house" into that game. You can at any time push items to that shared storage but you can only pull the items if you are at "your room".
And it has 1000 spaces, I think.
