Romanization 

Modified Hepburn romanization (as described below) should be used in all cases, excepting those cases where another romanization is determined to be in common usage in reliable sources.
Japanese terms should be romanized according to common usage in English-language reliable sources as indicated by policy, including unconventional romanization of titles and names by licensees (e.g., Devil Hunter Yohko and Tenjho Tenge—see below)—words used frequently in English (such as sumo or judo), the official English name for companies and organizations (e.g., Kodansha rather than Kōdansha, Doshisha University rather than Dōshisha University), or location names (e.g., Tokyo, Kyoto, Osaka, Kobe, Kyushu, Honshu, Hokkaido, Ryukyu Islands, Bonin Islands, Iwo Jima). The list of examples given here is not exhaustive. Redirects for all likely romanizations should be created to make sure people will be able to find the articles easily regardless of which form they use in their search.
To determine if the non-macronned form is in common usage in English-language reliable sources, a review should be done of all the related reliable sources used for the article (as well as any which may not have been specifically used, but can still be considered reliable per WP:RS). This may be redetermined periodically (generally no more often than semiannually) as usage changes over time and as new additional reliable sources become available. If it can not be determined whether the non-macronned form is in common usage in English-language reliable sources, then the macronned form should be used until such time as it can be determined.
If an article uses English-language reliables source and those sources use a particular form of romanization to name a topic, give preference to that romanization in the article title and body text. If an article uses only Japanese-language reliable sources, use the romanization given in them. If no romanization is given by the reliable sources used in an article, use modified Hepburn romanization. In all cases, the same romanization should be used for the article title and the body text (within that article and within the body text of other articles).
Please note that scholarly reliable sources (e.g., encyclopedias, academic journals, documentaries, and textbooks) and mainstream media (e.g., newspapers, magazines, and television reports) reliable sources are equally acceptable, and neither should be considered more valid than the other. However, more recent reliable sources should generally be given preference over older reliable sources, especially in topics and areas where current understanding may be more complete than older understanding (e.g., in science and technology).
[edit]General guidelines