well, the only way to really give it away is to tell the person your giving it to your psn id and password
No, a Japanese PSN account can only be funded with a Japanese PSN card, one with a yen amount on it.
Just make your own user account on your brother's PS3 and then make your own PSN ID name and whenever you log into YOUR user account, your PSN name/ID will be logged in also. This way you can have your own password, data, etc. without having to use your brother's PSN account.
by PSN you need a account to PSN
No you can't, PSN cards are country and currency locked. You cannot redeem German PSN topup cards on a UK PSN account.
Your PSN account profile should work across any Sony device that uses PSN.
To access the Japanese PSN, you need to register an account on PC, on the Japanese PSN site, and connect to the PSN on the PSP with that account.
The password is whatever you set it as when you registered your PSN account.
You only need a PSN account not a new one
System activation is where you log onto your PSN account on a PC, and register your devices (PS3, PSP, PSVita). Only systems you have activated in this way can log into your PSN account and use your PSN data.
Games are linked to the PSN account so that's not possible.
The history is not yours to transfer and belongs to PSN. The history remains under the PSN account and can not be moved to a new account
Scroll accross to the PSN icon on the homepage. Click forget account and then go back accross to update then allow update. When the update is complete go accross to the PSN icon again. Click on Create a new account.