From left to right:
Go-Green (Shou Tatsumi) - Middle child. Member of helicopter rescue unit
Go-Blue (Nagare Tatsumi) - Second oldest. Chemical Fireman
Go-Red (Matoi Tatsumi) - Eldest and leader. Member of rescue unit.
Go-Pink (Matsuri Tatsumi) - Only female and youngest. National Marine Hospital Emergency Paramedic.
Go-Yellow (Daimon Tatsumi) - Second youngest. Metropolitan Police Officer.
Out of costume, this pic shows them in the order:
Matoi, Matsuri, Shou, Daimon, Nagare
The team's father, who they thought was dead, was actually building a base for the Gogo 5. His robotic assistant is called Mint
Tatsumi Mondo Hikase Mint