The bulk update request #157 has been approved by @DontTouchMyCogs.
create implication sonic_(series) -> sega
create alias sonic_the_hedgehog_(series) -> sonic_(series)
create alias my_hero_academia -> boku_no_hero_academia
Sonic is made by Sega.
Two tags for the same series. They aren't both needed.
Same as above. The Japanese name is used more, so it should be the main one (unless you think otherwise).