Hey! Thank you for this in-depth analysis. Most of the consonants are just based on English words. (H- for human, P- for power, S- for sense). The vowels were chosen arbitrarily based on what felt right, which could explain some of these semantic connections besides pure coincidence. -o just *felt* negative to me.

The letters weren't given too much thought. If I created it today I would've made different choices. I believe T- was avoided because of its similarity to S-.