There are several artists known as Imaginary Friend, although only one is listed on MusicBrainz as having released albums:
1) Imaginary Friend is a Portuguese band formed in 2011.
2) Imaginary Friend is a dubstep artist.
3) Imaginary Friend is a seven member collective indie pop band from Finland.
4) Imaginary Friend was formed in 2002 by Neal Leatherman.
5) Singer-songwriter Jesse Epstein initially recorded as Imaginary Friend but is now recording as Imaginary Future.