Detonator Orgun

Often considered the spiritual predeccesor to Tekkaman Blade, Masami Obari's Detonator Orgun has many of the same aesthetics and design features as Tekkaman Blade. 

While not the best works of the mecha genre, Detonator Orgun and Dragon's Heaven offer an outlook that deviates from the usual mecha show. Obscure OVAs, yes, yet they are worth the look. 

Both are armored heroes, plot is WAY out or relation to eachother but that does´nt stop the fun from oldskool mecha suits till advanced goth armor designs in 3/d 

Both of the animes have giant robots, and some colossal battles, but when we talk about stories, evangelion is more, much more deep, and longer of course, it´s a complete anime, and orgun, it´s an OVA, and the story is way softer. I recomend these two, like an alternative for each anime, if you saw evangelion, try it out the detonator orgun, or ir you see orgun first, see evangelion. They are both cool  

Mecha series about invaders from space who know nothing but war and must find redemption through human emotion.