Heavy Metal L-Gaim

The series was produced as the follow-up to Aura Battler Dunbine, with director Yoshiyuki Tomino continuing from that previous work.

Tomino later stated that L-Gaim was 'half a sacrificial pawn before doing Gundam', since the planning for the follow-up series Mobile Suit Zeta Gundam had already started before this show even aired.

The total episode count was extended from a planned 50 episodes to 54; the episode 49 storming of the enemy headquarters was originally meant to be the finale before the extension.

22-year-old newcomer designer Mamoru Nagano was given the unprecedented role of handling both character design and mechanical design for a Sunrise robot anime, a first for the studio; Tomino had to convince a reluctant Sunrise to let a rookie handle both jobs after Nagano confidently claimed he could also draw characters.

The rebel-army-versus-Poseidal-empire structure and the light-sword 'Saber' weapons show similarities to Star Wars, which Nagano later cited as a favorite film that greatly influenced him.

Nagano proposed a human-machine hybrid organic computer concept called 'Fatima' for the Heavy Metals, but Tomino strongly rejected it, later issuing an official statement that 'Fatima does not exist in the world of L-Gaim'; the concept was later reused by Nagano in his manga Five Star Stories.

An earlier rejected concept had a robot-controlling female android named MARIA with an obviously mechanical face (unlike Fatima's human-like face), a design choice justified in-universe by the idea that women in this world would react badly to androids with fully human faces.

The term 'Heavy Metal' for the robots is said to be a play on designer Nagano's love of heavy metal music combined with the US Army slang term for heavy tanks; director Tomino initially disliked the name, finding it embarrassing, and had considered calling them 'Frosser Silhouette' instead.

The character Lilith Fau closely resembles Chum Fau from the previous series Dunbine in both name and appearance; this was a deliberate choice by Tomino, who was fond of Chum Fau, and voice actress Mari Yamura (who had already been cast as Lessy) ended up voicing both Lilith and Lessy, adjusting her vocal pitch to distinguish the two roles.

Nagano based the character design of Gavlan Gabley on Chris Squire, the bassist of the band Yes, whom Nagano admired and used as his own nickname.

The show's production connection led to real-life romance: voice actress Mari Yamura and designer Mamoru Nagano later married.

During production, designer Nagano was in a motorcycle accident, so animator Hiroyuki Kitazume took over the clean-up work on the Zedda mecha design in his place.

Nagano introduced the 'Movable Frame' concept, separating armor from the drive mechanism instead of the traditional monocoque structure where armor and skeleton were fused; this innovation was later reused in Mobile Suit Zeta Gundam.

A manga adaptation by Shigeto Ikehara, serialized in Comic BomBom, gave the story a completely different, fully happy ending than the TV series' more bittersweet conclusion, and this alternate ending has been praised by fans as 'another true ending' still discussed today.

According to Nagano, in a 1985 Newtype magazine feature, the entire story of L-Gaim was framed as a fairy tale unfolding inside a crystal ball owned by Jacoba Aon, leader of the fairies from Dunbine; as a fan-service nod, a Dunbine figure can be seen placed inside a ruined house in the series.