Can you remember reading a manga that you liked 10 years ago? What if 10 years ago you had inked a character of that manga on your skin? Today would you think it was a good idea? Tastes in manga change, yours have probably changed once already. The you of 10 years ago would probably have gotten a manga tattoo that you don't like now. The you of today will probably get a manga tattoo that the you in 10 years won't like. You shouldn't make a permanent decision based on enjoying a manga or movie or TV show or music band, or anything related to entertainment.