Rekishiteki-based Rōmaji
Consonants:
[null], k, g, s [s~ɕ], z [z~ʑ], t [t~tɕ~ts], d [d~dʑ~dz], n [n~ɲ], f [h~ɸ], b, p, m, r, y [j], w
Vowels:
a, i, u [u~ɯ], e, o
Doubled vowels:
ā, ī, ū, ē, ō
Historical word-medial {f}: v
consonant glides: ky, gy, sy, zy, ty, dy, ny, fy, by, py, my, ry
Additional consonant glides: kw, gw
Sokuon:
kĭ, k, tĭ, t
Classical auxiliary verb ~む -mu = mŭ
Hepburn ō (except if it's oo)
å, av, ô, ov, wå, wav, wô, wov
Hepburn ei: ê
Hepburn yū:
iw/ü, iv, yū, yuv
Hepburn yō (except if it's yoo)
ew/ö, ev, yå, yô
Moraic nasal "n": if ends with nu = n if ends with mu = m
Example (Kimigayo):
君が代は
Kimi ga yo va
千代に八千代に
Tiyo ni yatiyo ni
さざれ石の
Sazare isi no
巌となりて
Ivavo tonarite
苔の生すまで
Koke no musumade