Usually "Personalization" is BAD. It is MOST MOST often the sign of a bootleg, to be sure. Fake companies love writing names on things they find easy to print out. However, this particular banner was MADE to be personalized by the licensed company who made it. It's rather unusual that this would be allowed to be done at all. It may be the only legitimate personalize-able Sonic item to exist. You can see how it would work, there's the stock phrase "Have a Super Sonic Birthday" and then the party-person's name would follow. The banner features Sonic & Tails on a blue background.