A person who writes lyrics is typically referred to as a lyricist or a songwriter.
They write their lyrics themselves
Oli Sykes writes the lyrics, and the band writes the music.
Ruki writes the lyrics of the GazettE songs ;P
Short Stack write their own lyrics.
The lyrics of the song "Ice Cream and Cake" by Buckwheat Boyz can be found in lyric websites such as elyrics and metrolyrics. Some YouTube videos also have lyrics of the song.
himself mostly
The librettist is the "lyricist", the person who writes the "lyrics and dialogue" in an opera. Think of a contemporary songwriting team: "Music by Richard Rogers; Lyrics by Oscar Hammerstein".
New Boyz was created in 2008.
David writes the lyrics and Dan, Mike, and John write the music
A Librettist
Vic Fuentes