Yes, several. The most prominent two I can think of are Marvel's She-Hulk and DC's Jade (daughter of Alan Scott, the golden-age Green Lantern).
Poison Ivy
A Dinosaur with turbolasers for arms. His backstory is that his parents were killed by big game hunters and he is out for blood.
no there is not
Yes, there are train-themed characters in comics such as Marvel's "Silver Streak" and DC's "Bulletman" who have train-themed powers. These characters often use their super speed or abilities to fight crime or cause chaos.
There is no standard collective noun for a group of villains. The collective nouns for thieves can be used, for example a den of villains or a gang of villains. Or, since collective nouns are an informal part of language, any noun that suits the context or suits your fancy can function as a collective noun; for example, a collusion of villains or a connivance of villains.
no
i believe the west coast avengers were in seattle.
yes there is. blood singer by cat adams
Rage Rusty Collins Rampage Red Sonja Rogue
There are the ones who suck, like Supermans dog, superdog.
Wonder Woman is a member of the Justice League.
No. You can do the 5 non-flying villains in any order. You have to defeat the other 5 before you receive your flying power and then you can chase down Betty Jetty.