[dsojourn]

I don't come over here often, but thought I should point out that a bunch of people in the thread seem to confuse Las Plagas with Uroboros. Las Plagas is a parasite, a living organism all of it's own that takes over, and mutates and posseses its host based on random factors and needs. The different forms have nothing to do with the rate of mutation, age, or life-cycle of the Plaga, it's simply the case that different Plaga mutate differently depending on the host. Some just happen to produce the Kipepeos (the flying things in RE:5).

Uroboros on the other hand, is NOT a parasite, its a virus, specifically one created by a synthesis of basically all of the other viruses existing in the storyline to date (T-, G-, T-Veronica, Progenitor, etc., as well as their Plagas research). Despite what someone said above, it will ALWAYS produce a writhing mass of tentacle things regardless of circumstances, except in the small percentage of people, like Wesker, who it adapts to. And he's not the best case, cause his body was already a messy cocktail of this and that. Even amongst the few people it would adapt to, the result would always be different, because it was forcing some sort of mutation based evolution.