A transaction, once confirmed CANNOT be reversed. No matter how much powerful a person or entity is, nobody can reverse any transaction after the confirmation, not even Satoshi. Money sent by you, intentionally or by mistake is simply sent. You cannot do anything else about it.
No real-world entities are associated with any account. Cryptocurrency such as Bitcoins is transferred between addresses made from blockchains. You can analyse the flow of transactions but no user’s real-world entity is connected with their addresses.
Instant and Global
Cryptocurrency enables instant transactions in the network and can be confirmed in the following few minutes. The network is global, so the transaction can be to someone sitting next to me or some relative who have moved to abroad.