Anti hydrogen is basically the same as tpt's antimatter. As far as TPT goes, anti hydrogen/hydrogen would be the same as anti-proton/proton. In addition to that, positrons would be the same as electrons... Most of the Properties that distinguish these are not considered in TPT and would require more then additions of elements.
Also, which antimatter are you referring to? There is the kind that is formed from positive beta decay, and then there is the ant particle (anti-quark) formed in energy to matter conversions.

@billion57 (View Post)
Do you know exactly how they would behave?

My oh my, if I'd have a penny for each chemical or realistic element I've seen suggested and rejected by now, I'd have a million dollars.

@MasterMind555 (View Post)
Positrons would behave the same the same as electrons, ant-protons would behave the same as hydrogen, as would anti-hydrogen.

1. At least put down some uses. then we can sit around at least consider (*cough* argue *cough*) it.
2.If you really want it, suggest it
3.If that doesn't work, code it
4.If the computer suddenly refuses to cooperate with you on coding the element, take it as a sigh (I've heard stories....)

and seriously, If they are going to beheave exactly like the other elements, then there is no use.

We need positrons. They would anialate electrons only (would interact with all other matter the same way electrons do), and uppon such anialation they would emit a purple photon (to simulate the gamma-ray photon that would be emitted in such a colision for real, which in wavelength is closer to purple light than red light).