These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Tetsuya Tsurugi in the original anime was excessively prideful, prone to fits of jealousy, could not stand someone showed him up and sometimes he seemed more concerned about showing off than protecting the humankind. Other versions of him, though, are less jealous -he retains his pride, though, and he does NOT like him when someone doubts or slights his skills-.
Lets say that everytime he is featured, while every other character uses old version with slight modifications, he gets a brand new one while still keeping enough elements to resembles its original version. Good example is Mazinkaiser version which turns him into an older brother figure to Koji in a "protective older brother" kind, which is nowhere near the most other versions. And then theres the Shin Mazinger version...
Jun Hono in the original anime was a Type A Tsundere, half-black girl. In the original Go Nagai manga she was a Type B Tsundere and she looked full-Asian. It is said Gosaku Ota drew her like a half-black girl, though, and Go Nagai liked the idea and her race was retconned in canon.
Kenzo Kabuto can be a benevolent but harsh The Mentor and a lousyparent... or, depending on the adaptation, one of the villains.
Ensemble Darkhorse: Originally the Great General of Darkness was Big Bad’s The Dragon. However he became incredibly popular. In fact he is so popular than in the Mazinkaiser movie he led the Mykene invasion. The Emperor, Marquis Janus, Minister Argos… are not even mentioned, and even though the seven generals of the Mykene hosts show up, they are not identified like such.
God-Mode Sue: Lets face it, Tetsuya is definitely this in the Alpha Gaiden manga. He has shades of this in the actual show, but the manga turns him into a total ace and Ultimate Lifeform, and most notably he is the only character that is FEARED by SangerZonvolt. That says something.
Marty Stu - Replacement Scrappy - Creator's Pet: After decades, Kouji fans STILL bash Tetsuya by accusing him of being this. In any way, it's nothing compared with their even worse treatment of Duke Freed/Daisuke from UFO Robo Grendizer... Fortunately for those diehards, Kouji one-ups Tetsuya in Mazinkaiser, and Tetsuya himself aknowledges that he owes Kouji his life.)
One of the instances where Tropes Are Not Bad. Tetsuya IS a Marty Stu in any sense of words. He is literally superior than almost everyone on the series, considered as The Ace by everyone, including Koji who crossed to this line at times. Hell, even the Mykene ADMIRED Tetsuya's skills, frequently mentioned how he is indeed, an amazing warrior and a formidable foe. Its a mystery how Tetsuya himself is also the only person who doubt this, and this, combined with his Inferiority complex cost everyone a hard price. Things would be much better if he knew about this, really.
Rescued from the Scrappy Heap : People hated Tetsuya for replacing Koji during the 1970's. By the time of Mazinkaiser, theres enough number of people that is dissapointed by the fact that Tetsuya doesn't have enough screentime and overshadowed by Koji since Tetsuya is a much more interesting character.
Stop Helping Me!: Jun was a Action Girl with a worth-of-years extensive training like mecha pilot and martial artist. Likewise, Venus A was clearly more powerful than the Mazinger ZFem Bots). During her first mecha battle she fought the Mykene War Beast skilfully, gaining the upper hand several times. She could have won... if Boss would have not gotten in the way EVERY TIME she was about of finishing the Robeast off, telling her girls should not fight and he would look after the Mykene monster. Whenever she managed to shove him off, the War Beast had recovered and she had to begin again. The ironical part is Boss thought he was being chivalrous, charming and kind instead of an offensive and hindering nuisance.
Values Dissonance: Lots of people don't understand why Tetsuya feels so jealous of Kouji's position as Kenzou's true firstborn son, to the point of refusing to help him at some point - which causes Kenzo's death in the end. This is actually because Tetsuya is an orphan, and in a society where family and stability are all, orphans are extremely looked down upon even in adulthood. Therefore, when the full-blooded son and heir of the man who raised him came in, Tetsuya was shit scared of being abandoned again, and he knew that if that was the case, the still very traditional Japanese society would likely make him a pariah. It was was, WAY more complicated that mere jealousy between two adoptive brothers: for Tetsuya, it was a very tangible fear and a threat to his self-worth as a whole, even when it's not exactly fair to Kouji.
The Woobie: The Great Marshall of Hell sees himself like this.