Its a hmm researchable/craftable colonist.
Yeah, what he said

Mai is, hmm... a metal colonist with as much (or as less) possible work-options, as you are willing to do your research BEFORE building and activating her.
If you activate 'Mai' as soon as you've researched the basics, she will have the abbilities to haul and fight fires, but nothing else..
Later, if you've researched e.g. AI: combat tactics, your 'Mai 2' can help you, when an enemy tries to kill you.
But 'Mai' will always be a full time hauler..
