Dude, seriously, let someone else have a go

(Kidding, all excellent suggestions

)
Gremlins
Still somewhat unexplained, but something about the interaction of unobtanium, complex technology and human emotions creates mischief in a physical form. Technology around them starts going crazy - nothing particularly dangerous for the most part, just annoying, but over time that annoyance feeds back into the gremlin, feeding it more malevolence and creating something more powerful and...darker.
(Minion) - "Critter". A small, ambulatory construct of electronics and psychic force, using electric attacks and a variety of illusions to inconvenience passer-bys.
(Minion) - "Lobber". This minor gremlin's mischief is chiefly expressed through chucking debris at anyone it sees. More direct, but also more painful.
(Lt.) - "Gremlin". If a small manifestation is allowed to linger for a while, it will grow into one of these. Able to turn the ship's service robots and repair machinery to it's side, it will use these as it's primary method of attack, but also has more powerful electrical jolts at its disposal.
(Lt.) - "Tinker". Like it's counterpart, it's managed to hijack parts of the ship's own machinery. However, these manifestations are born primarily of curiosity, and produce various random devices, that can either defend an area or enhance other gremlins.
(Boss) - "Crashers". A gremlin that generates too much irritation and negative emotion around it will eventually grow into one of these, especially if any dark magic effects come into contact with it. These are aggressive and spiteful, surround by bits of whirling jagged metal for protection and capable of powerful psychic attacks and illusions.