Orphaned/Sandbox/Martia

Varian Durer

 * Angst Coma: after realising that he had accidentally allowed Zellyk to kill his sister. In fact, he shut down for a good decade.
 * Creepy Monotone
 * Conveniently Orphaned: Zellyk invoked this by killing off all of his family.
 * Dead Elder Sister/Dead Little Brother
 * Deceased Parents Are the Best
 * Extreme Doormat
 * Friend to Psychos: friend to Zellyk, and if Hailey counts, her too.
 * Knowledge Broker: one of the two characters created specifically for this purpose.
 * Last-Name Basis: both himself and to others.
 * Morality Pet: is this for Zellyk.
 * Not Good with People
 * Perpetual Smiler: which even Zellyk finds it creepy.
 * Terse Talker: subverted as he grew up.
 * The Stoic
 * Technopath: his abilities.
 * Neural Implanting: enables him to control certain machines with his mind.
 * Willing Channeler→Empty Shell→Willing Channeler
 * Will Not Tell a Lie

Zellyk Redmist
The stray that posseses Varian's body for a good part of the plot.
 * Adult Child: Justified in that, as a child soldier, it was never developed socially or emotionally.
 * Psychopathic Manchild
 * Amplifier Artifact: though all strays are this, this is specifically Zellyk's main power: to possess a body and buff it into Super Mode. Which makes it...
 * Good Powers, Bad People
 * Becoming the Mask: when possessing Varian's body for a long time.
 * Blue and Orange Morality
 * Child Soldier: what it was when alive.
 * Crazy Survivalist
 * Crippling Overspecialization: it is able to fight like a monster when possessing someone, but is completely helpless without a person who shares the same goals as itself.
 * Kick the Morality Pet: and it does this without understanding why it's called kicking.
 * Kids Are Cruel: this, when it was alive.
 * Lack of Empathy
 * Ominous Fog: this is how it's form is like. (Rather unique, for a stray.)
 * Puppeteer Parasite: it's ability, which only works on a crosser it is linked to. Otherwise, it is...
 * Sharing a Body: ... when another person shares the same goal or intentions as it, Zellyk is able to do this. See "Amplifier Artifact" above.
 * Slasher Smile: when possessing someone and in "super-mode".
 * Yangire

Constance Durer

 * Cloudcuckoolander's Minder: to Varian
 * Cool Big Sis: an actual big sis to Varian, and also to Zellyk.
 * The Ghost: well, both literally and the trope.
 * Theme Naming: Constance (constant), Varian (variable) and Equates (equation).