The reason why it is impossible to get the legacy tattoo has been answered by several people. If you even understand our explanations, any further persistence simply makes you appear arrogant and quite rude.

Square Enix has given us many different customization options for our characters. Accept what you are given, or try to look for a different game that satisfies your hunger.

This thread has been exhausted countless times in the past, as well as now. Please move on... You should find something more important to occupy your time. D: