RIP.
Was Trelayne retconned into being a Q?
Supposedly, but if he was Q, he was clearly a child Q (but no less dangerous). Deft acting on Mr. Campbell’s part to interpret the role as a “naughty boy,” and of course being scolded for mistreating his Human “pets,” as though they were hamsters he was taunting on a wheel. His “parents” weren’t much interested in the Humans at all (might be one argument why they might not have been Q, but just another superior race from the ethereal plane of reality, for which there were quite a number of on TOS).