Martin DaCosta

Martin DaCosta served as Andrew Waltfeld's second in command onboard the Lesseps until it was heavily damaged by the Archangel and Waltfeld was defeated by Kira Yamato's GAT-X105 Strike.

DaCosta later appears in the second volume of Gundam SEED Astray R during which the Junk Guild arrive to look for a ship to use on land since their spaceship has been damaged during entry. However, he is still aboard the damaged Lesseps and at first doesn't let Lowe Guele and the Junk Guild take it. Lowe then asks Martin for his permission to help him fix the Lesseps. DaCosta agrees. However, Blue Cosmos is also in the area. Knowing that there is a coordinator aboard the Lesseps, they decide to attack. ZAFT soldiers also attempt to destroy the Lesseps because they were informed that Blue Cosmos is using it now. However, Lowe Guele in the Astray Red Frame is able to defeat all the enemies and ultimately causes the Blue Cosmos forces to retreat. DaCosta is then shocked that Lowe Guele, who is a Natural, would help a Coordinator and fight off Blue Cosmos, who are Naturals like Lowe. This makes DaCosta question the entire war and could be the reason why he joins the Clyne Faction later on in the series. The two develop a strong friendship and part ways.

Later in Gundam SEED, Martin DaCosta joins the Clyne Faction and helps move Lacus Clyne underground after the theft of the ZGMF-X10A Freedom. DaCosta then helps rescue Athrun Zala, who has been held prisoner by his father, Patrick Zala, at the request of Lacus. He is successful in rescuing Athrun and the two escape to the Eternal, a new ZAFT support ship stolen by the Clyne Faction, which has his former superior Andy as a captain.

In Gundam SEED Destiny, DaCosta returns to his position onboard the Eternal. He also works to gather intelligence for Lacus on Gilbert Durandal, the chairman of PLANT. He manages to find out more about Durandal's "Destiny Plan" while investigating the Mendel Colony, where Durandal once worked as a scientist. His discovery turns out be exactly what Lacus was seeking but he made a mistake during his escape and ended up leading ZAFT right to the Eternal and Terminal's secret mobile suit manufacturing plant. Fortunately, after the Eternal leads the ZAFT forces away from the factory, Kira Yamato soon arrives in the MBF-02 Strike Rouge,and after receiving the ZGMF-X20A Strike Freedom eventually disables all of the ZAFT forces.

Martin is dutiful and skilled, but also quite uptight, which causes Andy to tease him at times.