Tamotsu Kodate is the father of Mamoru Kodate and head mechanic of ALVIS, first introduced in the Dead Aggressor portion of the anime.

As with all of Tatsumiya's adult citizens, Tamotsu was one of many affected by the sterilization of Japan's people by the Seto Inland Sea Mir. In the aftermath of this event and the resulting attacks on Japan, Tamotsu would go on to join Japan's Arcadian Project, making a new life on Tatsumiya with his wife, Chisato.

~!Some time after the birth of their son, a young Mamoru began to wish for manga to read, starved of any entertainment on the small island. With no option but to reproduce old material, Tamotsu began creating manga for his son's sake. Eventually feeling that merely copying old stories wasn't good enough, Tamotsu exhaustively practiced his drawing and writing day and night, producing the original manga Mobile Samurai Goubain as a true gift to his son. As author of the manga Mobile Samurai Goubain, Tamotsu takes on the pen name "Anko Otsubu" (大粒あんこ)!~

(Source: Alvis)

Tatsumiyajima is the central island in the middle of a small cluster of islands, in a sleepy backwater of the Japanese isles. Not much happens there, and the island's young people go to school knowing that their lives are likely to remain peaceful and undisturbed. Or so they have been taught... but the truth is different. The fate of mankind is on the line, and Tatsumiyajima is the last line of defense against a hostile and incomprehensible enemy. At the center of it all, fighting for Humanity's continued existence, is the giant robot Fafner, the dragon that guards this final treasure of mankind.
 
(Source: Anime News Network)
 
Note: The last episode aired with a runtime of ~48 minutes as opposed to the standard 24 minute long episode. In the DVD release and subsequent home video releases of the series, the final episode was split into two separate ~24 minute long episodes.

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Non-anime roles:
~!Eichi Gotoh in "Ghost in the Shell: Stand Alone Complex" (VG), Gawn Brawdia in "Wild Arms: The 4th Detonator" (VG), Jinxer in "Power Rangers: Lightspeed Rescue", Lino En Kuldes in "Suikoden IV" (VG), Scorpius in "Power Rangers: Lost Galaxy", Shaft in "Castlevania - The Dracula X Chronicles (Symphony of the Night)" (VG)!~

2150 AD. The battle against the silicon-based Festums from outer space reaches a new phase. Fragments of the North Pole Mir were scattered throughout the world. Eventually, they began to act on their own as independent Mirs. Most hated humanity and attacked them, but some chose to coexist with mankind. Some with the same way of thinking existed within the human race, as well: those who were both human and Festum. They added to the chaos of the battle and brought about even more hatred.
 (Source: Crunchyroll) 
Sequel to Soukyuu no Fafner: Dead Aggressor, set two years after Heaven and Earth.

Second season of Soukyuu no Fafner: Exodus.

A hiveminded alien force reengages war with Tatsumiya Island years after Kazuki led a team of mech pilots to destroy them. In an explosive battle over the fate of humankind, the young warriors risk everything to save their only home from assimilation. (Source: Crunchyroll)

Episodes 10-12 of the Soukyuu no Fafner: Dead Aggressor - The Beyond series.

Episodes 4-6 of the Soukyuu no Fafner: Dead Aggressor - The Beyond series.

Announced at the Soushi Minashiro Birthday Fes 2021. Initially promised to fans during the 2017 birthday event, this self-contained entry to the Fafner series will be a "peaceful spinoff". 
(Source: Anime News Network, edited)

Tatsumiya Island is a small, idyllic haven for those lucky enough to call it home...until a surprise attack by a savage enemy shakes the water-locked paradise to its core. With Festum on the warpath, it's up to the island's dedicated inhabitants to pilot powerful Fafners and fight back! Before the gun smoke clears, illusions will be shattered and lifelong friendships will be stretched to their limits. Will this peaceful island survive the chaos of all-out war? Fafner- Dead Aggressor is a full-throttle fight in the name of defending peace and defeating evil! When a group of friends gears up to take on vicious Festum attackers, there's no telling who will become a hero...and who will be sacrificed to the ravages of battle. Life as they know it is on the line, and these brand-new soldiers learn to trust their instincts (and one another) in order to man their Fafners with fearless skill. Man and machine unite to take down all invaders...and save the homeland!
 
(Source: DMP)