In Heisei system, Altman's color mostly represents his own form, and he can deal with different enemies by switching different forms. One of the most typical is Degas (he is typical, because he is the one with the highest cognition in China). In the first episode, Dijia showed the red strong type and the blue empty type. The red form has the highest strength, and its strength directly defeats Gorzan to escape, but it is not agile enough. Melba easily escapes the red fly kick. If you find that the red type loses money, it will become the blue type, and Mei Erba will be wiped out in one fell swoop.
Dana's red is similar to Dijia's, but the blue is different. Dana's blue style has become a miracle type, and more is to know a lot of super powers (it is said that Altman's tricks are all super powers, aren't they-_-#), such as changing the weather, making small black holes, fighting in two places at once, and so on.
On the other hand, Gaia is different from the first two. He doesn't switch the color form of the same level, which belongs to a form of improving ability. Gaia gained the power of AguruAltman (the first blue Altman in Heisei Department) in the play, and then evolved into V2 type. Later, he gained more strength in the battle and evolved into the highest type (I can't think of another word, so I have to use the word evolution, please forgive me).
As for Ciro, he was the first Altman with a red, blue and showa worldview. His father is Saiwen, the red Altman, and his mother's identity is still unknown. She must be the blue ultraman. After meeting Dana and Gauss (see The Legend of Altman), Ciro also has the ability to transform, and his form represents the power of Dana (red) and Gauss (blue). In the rumor, Ciro is also in the form of flashing Ciro, which can make the ability to turn back time to the extreme.
In the later Galaxy Altman, Altman and Aubrey Altman, there was no difference in color. We see that the Galaxy Crystal will change color when it releases moves, and it will only change color when it releases moves. Moreover, the Milky Way is from the future Altman. What will happen in the future? Everything is unknown. (Later, these Ultramen in the new world can only say that they are completely different from the previous Ultramen.)