Question: What fictional race of extraterrestrial shapeshifters does Lyja belong to?

Context paragraphs:
Symbiote (comics): The Symbiotes (originally known as the Klyntar) are a fictional race of amorphous extraterrestrial symbiotes appearing in American comic books published by Marvel Comics.  The Symbiotes bond with their hosts, creating a symbiotic bond through which creates a single entity.

Manhunters: The Manhunters are a fictional race of extraterrestrial robots that appear in titles published by DC Comics.

Mysteron: The Mysterons are a fictional race of extraterrestrials.  They are the remnants of the original Mysteron race, extraterrestrial life forms that originated in a galaxy other than the Milky Way and maintained their colony on Mars.  They appear in the British science-fiction Supermarionation television series "Captain Scarlet and the Mysterons" (1967–68) and "Gerry Anderson's New Captain Scarlet" (2005), symbolised by ubiquitous projected green rings and the deep bass voice of their human convert, Captain Black.

Brood (comics): The Brood are a fictional race of insectoid, parasitic, extraterrestrial beings appearing in American comic books published by Marvel Comics, especially "Uncanny X-Men."  Created by writer Chris Claremont and artist Dave Cockrum, they first appeared in "Uncanny X-Men" #155 (March 1982).

Bruce Coville's Shapeshifters: Bruce Coville's Shapeshifters is a work of juvenile fiction.  It is an anthology of short stories compiled and edited by Bruce Coville for Avon Camelot Books.  It was first printed October 1999.  Steve Roman is credited in the book as assisting in its creation.  Bruce Coville's Alien Visitors and Bruce Coville's Strange Worlds are in the same series.  These books are similar to Coville's anthologies for Scholastic Publishing, starting with "Bruce Coville's Book of Monsters".  Both series include stories by award-winning fantasy and science-fiction authors such as Jane Yolen and Ray Bradbury, as well as other supernatural and extraterrestrial stories from a broad range of other writers.

Chitauri: The Chitauri are a fictional race of extraterrestrial shapeshifters that appear in publications by Marvel Comics, specifically in Ultimate Marvel.  They were created by Mark Millar and Bryan Hitch.  They were created for the Ultimate universe franchise in place of the existing Marvel Comics alien species, the Skrulls, which play a similar role in the franchise's mainstream continuity.  Later, Marvel would choose to distinguish between the Skrulls and Chitauri of the Ultimate universe.  The species would later be adapted to other media, notably appearing in the 2012 film "The Avengers" as an invasion force led by Loki and even in the main Marvel universe.

Skrull: The Skrulls are a fictional race of extraterrestrial shapeshifters appearing in American comic books published by Marvel Comics.

Lyja: Lyja is a fictional character appearing in American comic books published by Marvel Comics.  A Skrull, she possesses the ability to shapeshift into almost any humanoid or animal form.  Modifications on her body give her the power to generate energy blasts.

Sidri: The Sidri, also known as Sidrian Hunters, are a fictional race of extraterrestrial beings in the Marvel Comics universe.  They are adversaries of the X-Men.  Created by writer Chris Claremont and artist Dave Cockrum, they first appeared in "Uncanny X-Men" #154 (February 1982).

Koopa Troopa: Koopa Troopas, or just simply Koopas, known in Japan as Nokonoko (ノコノコ ) , are a fictional race of turtle or tortoise-like creatures from the "Mario" series, as well as its sister "Yoshi" series.  Although the term 'Koopa' is a blanket term for the entire species of anthropomorphic turtles in the series, to which creatures such as Lakitu, Hammer Bros. and even Bowser belong, the term is often used to refer colloquially to this particular enemy.  First appearing in the 1985 Nintendo Entertainment System game "Super Mario Bros.", they are among the oldest recurring enemies in the series, and have appeared in some form in all of the main games, and most of the spin-off games.  When defeated, Koopas may flee from or retreat inside their shells, which can then usually be used as weapons.  Shellcreepers are a different species, according to their trophy in "Super Smash Bros. for Nintendo 3DS and Wii U".  Koopa shells are a recurring weapon in the series, particularly popularized in the "Mario Kart" series, in which they can be fired as projectiles against other racers.  Despite making up the bulk of Bowser's army, known as the "Koopa Troop", Koopas as a species are often shown to be peaceful, some even teaming up with Mario.  An undead Koopa Troopa becomes a Dry Bones.

Supporting paragraphs: Lyja Skrull
Answer: Skrull