The ones they do have aint bad but , I just wish I was able to have an anime avatar to an anime I watch , Japanese account users are lucky they have decent anime avatars
Same, but I understand why it's not done. It requires a lot of time to license them, and with how anime is such a niche market here, it's not really worth doing in the first place. Maybe for the stuff that has managed to creep its way into mainstream culture such as Naruto, Dragon Ball Z, and to an extent Bleach, but for shows not really known to those outside of the anime community like Lupin III, Rose of Versailles, Attack on Titan, or Shakugan no Shana, it's not really worth it.
(And no One Piece is not mainstream. Only in the anime community is it mainstream.)