Amisia is an indigo-blooded troll who bears the Sagira sign. This makes her a highblood with a great deal of power, despite her youth. Amisia seems to live a relatively carefree life indulging her ambitions to become a skilled painter, despite her carefully concealed lack of aptitude. Although not overtly cruel or vindictive, Amisia shows very little regard for others, casually harvesting their blood to use as paints in her hobby.

Unlike many other Alternian highbloods, Amisia's front-facing attitude to other people is not overtly hostile, a fact which initially disarms the MSPA Reader. On the contrary, Amisia initially shows kindness and concern for the Reader, healing some of their injuries and complementing their appearance. However, being raised in a society that has emphasized Amisia's status over others, the unimportance of lowblood lives, and which caters to her whims, has seemingly instilled in her a prevailing lack of care for others who are below her station. She cares about her "inferiors" mostly in relation to how she can use them, and she casually slaughters innocents for the purposes of her vain artistic aspirations.

Amisia seems to live a relatively carefree life pursuing her own wants and desires, utterly enabled by the society around her. Her commitment to living the life of a cultured artist despite her lack of commitment or skill to actually painting, and her disdain for others who she feels are below her high-brow artistic persona feels highly egocentric, although it is unlikely that she was taught anything other than to serve her own wants. It also seems that much of this persona is a front to hide her own insecurities at her inability to actually paint, as she explains tearfully to the MSPA Reader during her "good" ending.

This lack of emotional maturity in her interactions, carefree and whimsical personality, as well as her youthful appearance gives her a childlike aspect, although her actual age is not known. However, the narration at one point describes her as a "cute little alien girl", so it may be that Amisia is a younger child compared to many of the other Hiveswap Friendsim trolls.

Despite her small stature, Amisia is able to lift and swing her large axe with ease, much to the surprise of the MSPA Reader. This could indicate that Amisia has some degree of enhanced strength, much like her fellow indigo blood Equius. Unlike him though, she is not uncomfortable making a rude gesture (like in the player's bad route at the beginning) and using inappropriate language in one instance.

I'd imagine her sounding like the stereotypical 'nerdy girl' and like she's about ten years old.