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.
VSQ/VSQX/UST creation should be credited as voice manipulation, but if the artist did nothing else, they should be marked as support because they were not directly involved with making the song.