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unicorn is a company with a valuation of over a billion before being listed. hololive nijisanji, phase connect etc are usually referred to as unicorns, whether they actually are is up to debate. a hag is a hololive anime girl, ie just another term for hololive girls. a schizo is as the name implies, someone who is schizophrenic, but it's just an insult there's no need to worry, all the people here are mentally stable. finally, a rrat is just a funny sound pekora did once, and calling things rrats is just saying it's funny.
hope that clears it up.