Cromwell
[X] [Earth]
[X] [Air]
Earth magic for creating pits to trap animals in or protective trenches and walls, creating stairs in the side of mountains so people can climb up, bunkers to hide in, etc.
Air could conceivably be used for purifying or deploying gasses, concealing scent, push a sailboat, etc.
Shadow could be cool, like absorbing light or something (could conceivably absorb radar waves?), but I'm struggling to think of how that would be really useful all of the time like Earth and Air.
[X] [Utility Specialist]
Combat skills seem to be very situational. They only make sense if we are going to be constantly running into violent encounters (ie, every animal on the planet is trying to kill us, or we enter a war later on). Utility skills can be useful is nearly every circumstance, all the time. So I'd go with either utility or enchanter. Dunno what enchanter does.
Alexandra
[X] She just loved nature and animals so much that she became as familiar with them as possible.
Maybe she can tame the wildlife here and we'll get cool alien pets out of this.
As for the zoology... if we're going to tame beasts, then fish are out of the picture because humans spend most of their time standing on something, not swimming in the water. So if she tames a fish it can't come with us. Everything else seems to be fair game. The "life of non-terrestrial origin" might make her better able to tame and perform veterinarian work on weird stuff like floating gasbag cows or something.
[X] Life of non-terrestrial origin.