Technically I was looking for the "bass guitar".
An ancient past time
[breaking the 4th wall]- just describes music
"form like voltron
to take on all." - rap lyric from 90s and your party forms a band
Equip-able to any
for the player to assign, - you can assign which instruments
uplifting the spirit,
time for the team to shine.- trying to cheer squall up.
Amongst teen angst, - remember he runs off
held while booked- you hold the guitar during a concert (which is booked)
the 3rd most popular in trios
important but overlooked. - this describes the "bass" as a trio in rock is guitar drums bass.