[@VitaVitaAR] My draft for Teratoma's entry in the anomalies list, feel free to edit as you desire:

[b][u]Branch-092 Contained Anomalies:[/u][/b]
[list][*][u][b]A-188: Teratoma[/b][/u]
[*][u][b]Grade:[/b][/u] Esh
[*][u][b]Description:[/b][/u] Subject is an amorphous pseudo-organic entity best visually described as a pulsating mass of red eldritch flesh, capable of extensive shapeshifting and anatomical mimicry. When told to be more 'presentable' without any specific guidance, Subject will mimic A-187's overall build and appearance with some key differences, chiefly being hair color and apparel, they're dark green and a white sundress respectively.
[*][u][b]Containment Protocol:[/b][/u] Due to imprinting after A-187's personality and demeanor, Subject is quite docile and cooperative to instructions. Indoctrination is the best method to 'contain' it, but should physical containment become necessary, Subject must be contained within a secured bunker, hermetically-sealed without even an inch of opening as Subject is capable of squeezing even through the narrowest of gaps. Meat - preferably raw and fresh - has been shown to effectively pacify the Subject should it's agitated.
[*][u][b]Anomalous Qualities:[/b][/u] Subject appears to have originated from another plane of existence that can be colloquially described as 'Lovecraftian'. It is a biologically immortal creature capable of consuming any organic material and gaining information to mimic those it has consumed. It has no identifiable internal organs (excluding those it has mimicked) except for a tennis ball-sized 'core' that appears to function as its brain. Any physical damage done to its body is ultimately reversible as long as the core remains functional. Though a living creature of flesh and blood, it doesn't think, feel, or function as we do, but it can adapt. In relation, facility and field observations suggest that psychological phenomenon from Anomalies or otherwise unpredictably affect Subject; it's apparently immune to A-187's gifts and when subjected to Ms. Yamamizu's 'Drowning the Sins' curse, Subject enters a blissful dream where it's having an endless feast of marine animals instead of a drowning waking nightmare.
[/list]