Mazinger (マジンガー, Majingā) is a long-running series of manga and anime featuring giant robots or mecha created by Go Nagai in 1972.
MazinKaiser looks more heavily built than either of them, and sports the typical over-detailed (more ornate) style of more modern mechas (consider there's a 30-year gap between the first two and him).
(These are also called "Spacer") Traditionally, Mazingers are controlled thanks to a flying vehicle that docks on the mecha's head and activates it.
In Great Mazinger, this device takes the form of Brain Condor, and in Mazinkaiser it's called the Kaiser Pilder, which resembles Brain Condor more closely due to its sharp shape (in contrast to Mazinger Z's Pilder, that had a more bulbous shape) and the way it rests on Kaiser's head, leaving one of its fins standing vertically like the crest of a rooster.
These aircraft are always red, except in the Mazinkaiser OVA version of Mazinger Z, where the Hover Pilder is white.
Some times Grendizer can stand on top of the spaizer and use it to fly so it can have more freedom in aerial battles.
It also allows Mazinger to use a new attack, the Big Bang Punch, which consists in Shin combining with the God Scrander and transforming into a gigantic hand, and later making a fist that immediately turns golden-coloured, and is used as a scaled-up Rocket Punch.
No female mechas were included in Grendizer, but characters like Hikaru and Maria prove to be helpful and brave in battle.
Many characters appear in different points of each plot; Mazinger villains tend to be bizarre, having a dual nature or bodies that are made of disparate parts: One of the main attributes of the Mazinger series is the existence of a large amount of evil mechas, which are incredibly varied in shape and weapons and serve as monsters of the week.