Invulnerability as it appears in Teen Titans fan-fics.
Justice Evolution - Thanks to their invulnerability, Superman, Superboy, Martian Manhunter, Wonder Woman, and Hulk are the most important to send out against various villains, with the same being said about Darkseid, Zod, Grundy, Amazo, Sabertooth, Juggernaut, and Apocalypse.
Teen Titans - Thanks to his invulnerability, Superboy is very durable against enemies, the same being said about Metallo, Bizarro, Zod, Jax-Ur, and Mala with help from Superman and Krypto.
Starfire and the Seven Tiny Titans - Thanks to their invulnerability, Superboy and Wonder Girl are very durable if they and their friends get in trouble.
Superboy - Superboy developed his invulnerability early due to a genetic mistake. Also, his deceased father, Superman had that power.
Conner - By the time he was a teenager, Conner had developed his invulnerability, becoming as durable as Superman and Martian Manhunter, his invulnerability is so great, he can push Darkseid's omega beams back at him, negating Darkseid's invulnerability.