Fun fact: Denkou Choujin Gridman (Hyper Agent Gridman) is one of the first giant tokusatsu heroes to get an anime! Here i show you a little comparison video between the short teaser for the show named “boys invent great hero” which is animated by Trigger (the gurren lagann guys and partially people who did evangelion which is from gainax) and the live action scenes which the teaser had shown in animated form: