Does your typical analog non-powered mixer boost the mic inputs to line level for all the signal processing ie. effects, eq, panning, or does it remain mic level?
Almost all mixers work at line level, although what everyone classes as line level is not the same. Pro line level = +4 dBu and consumer line level = -10 dBu.
generally anything with a preamp moves signal from mic level to line level.
I've never heard of a "non-powered mixer" that handles amplification from mic to line level. Hell, I haven't even really heard of many (if any) "non-powered" mixers to begin with. amplifiers need both a signal source, and a power supply.
Do you have a particular model your thinking of? Because this question honestly doesn't make much sense to me.