On the topic of suggestions, I ran a theory on psionics by Zombie, and they told me to show it to you guys while they thought it over. So, with that, prepare for headcanon dump.
Yes, I have a chart. Threw it together in like twenty minutes last night, not as complete as I'd like, but whatever, you aren't here for me talking about how I made the chart. Anywho, my personal theory on psionics is based on three primary and three secondary colors, as seen above. To start from the top of the primaries, you have Red, which focuses on Power. Psi skills that come easily to red psions might be something like psi lance or telekinetics, direct applications of force via the mind. After that you have Blue, which is Control. Blue psions might find it easier to use skills that directly control or manipulate the mental state of others, whether it be through powers such as mind control, psi inspire, and the dreamscape power. Lastly, you have Yellow, associated with intuition and observation (shortened to Wisdom), which to be honest is all based on conjecture, but eh, what isn't. A Yellow Psion would likely have talents with powers such as ESP and illusions, enabling them to observe what cannot be observed, and ensure that they aren't.
Now comes the fun part: the secondary colors, Purple, Orange, and Green. These come as a result of intersection between the Primaries, and represent the mixing of their 'philosophies'. To start, Purple, whose psions excel with powers such as mind fray, psi panic, and imbuing objects with psionic energy. Essentially, using power to control or visa versa. Then you have Green, which psions such as Chandra have shown to be associated with healing, but could also find talents for things such as telekinetic fields and mind merging. In short, using observations and intuition to guide yours or others control of reality. Finally you have Orange, which is what happens when you cross Power with Wisdom. An Orange Psion would find it easier to use powers such as neural feedback and rift, using their intuition to find weaknesses in their opponent and striking there with overwhelming power, even if that opponent is reality itself.
Of course, just because one is a psion of a certain color does not mean that it is impossible for them to use powers from other colors, it merely makes it more difficult to learn the power. For instance, Desmond (a red psion) initially required specialized equipment to create a dreamscape (a blue power), but eventually with training he was able to perform it without assistance. However, Atka, whose color matches the power, was able to use it almost immediately after learning it from Desmond, and with a greater degree of skill. In short, the difficulty rises the further you get from your color, starting with intrinsic at your own color, and rising to a feat of dedication on your opposing color.
I hope you all like my theorizing, I hope to hear your thoughts and comments on it as well as where I should shove this conjecture should it be disliked.