[Fortuna]: Luck depends on no one....right? (4/3)

True, but in the case of Cleo she'd also get 5 green traits to help compensate for her complete lack of traits. Plus we've got Adrax to cover the intelligence department and we don't have much need for an engineer on the crew anymore. Seems to me like she'd get the most improvement out of this.

I think we could use an engineer actually. We just got a whole bunch of scrap with the new ship and we got more scrap when we beat the Somnus unit. We can go upgrade the living heck out of our robots and weapons.

The real question is what positive traits do we give her. Personally, I'd go with:
-stuff-

If we're talking traits I'd go with
(Spoiler'd cause it's kind of a tangent and takes up space.)

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For size
[Protective] (Useful for a physically focussed character and leaves at least some part of Marble's original personality in tact.)
[Cryomancer]([Psychic powers] is kind of a general trait, and Adrax can already do it. A specific mancy should be more powerful, and Cryomancy, crontrolling ice and cold, would fit with marble's thing where she counteracts her families fire.)
[Street smart](Compensates a little for the loss of brains.)
[Motivated]/[Adaptive](These could help migitate Marble's reaction to the potion's effects.)
[Never misses](Good combat trait.)

I wouldn't go with [Pack Mule] since Marble can already carry 12 weight units worth of items, and Marble can probably take quite a bit of fire with her high endurance if she needs to so I don't expect [Fireproof] to help that much.

Other traits to consider would be [Cute] since it might make it easier to sail ships, thus making it easier to get cool hybrids, [Chip Magnet] because every stat sheet could use [Chip Magnet] and [Animal Communer] to hopefully help deal with the pterodactyl.