Person who made or animated the PV. Required for Music PV and Drama PV song types.
Arranger is the person handling the instruments and producing the music. Most of the time this is related to remixes where the remixer is generally credited with the arranger role, but sometimes for original songs the roles for composition and arrangement (music production) are divided as well.
The person who created the song. Most of the time for original songs, the composer and arranger are the same person, but not always.
Circles get this role by default. Sometimes it's necessary to give the role to custom artists, other groups or individual artists if they're handling the distribution.
Person who made the illustration for either a PV or album cover. Also booklet illustrations.
Person who wrote the lyrics.
Person who operated the voice synthesizer.
If person A simply operated the synthesizer and person B did majority of the vocal tuning, then person A should be marked as support and B is the main voice manipulator. If an existing vocal data from another song was used, the vocal data provider role should be used for person B instead.