Tattoos and theme parks Japan

how strict are theme parks like universal studio in Japan with tattoos. what if you can't cover them up, such as it being on the neck?

Theme parks don't really care if you have visible tattoos because it's not as if you're trying to expose parts of your body like you would at an onsen. You would be perfectly fine, so have fun wherever it is you're going to.

If you really were concerned about it, you could always check the website for their official view on tattoos, not that I imagine that they would even post something about it there, but check if you'd like.