User:Rhialto/japanese romanization

Point of Difference	kana / kanji	Kunrei-shiki	Nihon-shiki	Hepburn	JSL	Wapuro
S-row	し	si (sya)	si (sya)	shi (sha)		si (sha)
T-row	ちつ	ti tu (tya)	ti tu (tya)	chi tsu (cha)		ti tu (cha)
H-row	ふ	hu	hu	fu		hu
Z-row	じ	zi (zya)	zi (zya)	ji (ja)		zi (zya)
D-row	ぢづ	zi zu (zya)	di du (dya)	ji zu (ja)		di du (dya)
particles	はへを	wa e o	ha he wo	wa e o	wa e o	ha he wo
long vowels	ああ	circumflex	circumflex	macron; ii and ei in the case of words that come from Chinese or Japanese; doubled vowel for all except ei (e.g. supein) for modified Hepburn; many variations exist		hyphen or doubled vowel or ou, mimicing kana spelling
geminates	っ	double next consonant	double next consonant	double next consonant; exception ch -> tch		double next consonant
syllabic n	ん	n; n' before vowel or y	n; n' before vowel or y	n; n' before vowel or y; m before p, b, or m; always n or n' in revised Hepburn; always n-macron in modified Hepburn.		n; n' before vowel or y; nn in many IMEs

Many variations exist in wapuro romaji, as most computer manufacturers have their own standard; there is in fact no official wapuro standard. Most manufacturers devise their own, adopting bits of other standards, and in internet chat, many people will improvise a version, usually relying on a close approximation between kana spelling and romaji spelling.