[Sangetsu]

You might as well lose the dyed hair, it will not impress anyone here, as a foreigner you will get enough stares even with your natural hair color.

Tattoos and body piercings continue to be frowned upon by employers, and even places like amusement/water parks. More than likely, if you apply for a job with one of the larger schools, their dress code will prohibit visible tattoos, but many teachers do wear slacks, so it's not so much of an issue. As for the amusement/water parks, they will simply deny you entrance.

If you interview for a job, be sure to wear something which will cover the tattoo, especially if you are being interviewed by a Japanese.