Board Thread:Wiki Discussions and Support/@comment-1207741-20150425210552/@comment-945885-20150426001040

It's purely a localization choice, since Japanese has no capitalizations. It just doesn't look right to me when it's not capitalized. Ninjutsu, chakra, taijutsu, kekkei genkai are all very common words in this setting, there's nothing special about them. They're broad. Fire Release is more granular, it stands out more, it just feels like it should be capitalized.