So given the rise of class-based shooter mmo's such as team fortress, valkyria chronicles, star wars battlefront 3, borderlands 2, battlefield 3, etc.., I've been wondering about how such classes correspond to the classes in class-based fantasy mmorpgs. Given the basic classes, rogues, warriors, healers/clerics, and mages, how do they correspond to the classes in shooter mmorpgs?
For example in valkyria chronicles, I see how healers, rogues, and warriors fit in, but where do mages fit in? In team fortress 2, it's obvious the healer is the medic. The infantry, spies, demoman,.... all fit in within the rogue/warrior classes. But where do the mages fit in? The engineers?
This raises the question of what exactly defines the mage class rather than simply magic? Are there are other things that define such a class? We can label it as squishy and dps class, but at the same time, so are rogues?
So what class in class-based shooter games correspond with mage classes?
What do you guys think?

1) Say that you like the rogue and warrior classes. Since there's the general concept of it, can one relate this to other classes in other class-based shooters?
2) How would this relate, and what would we have to look at to relate the classes?
3) Are the base classes of mmorpgs rogues, warriors, mages, and clerics?
thanks

In short, all I'm trying to figure out is how classes in fantasy rpgs can relate to classes in class-based shooters or in any other genre.

Demoman fits the mage archetype when you're not going DemoKnight - squishy ranged nuker.

Isn't the demoman more of a rogue? Because the rogue always sets traps. Also, I see mages as more of a scientist/engineer who makes their weapons. While the rogue is capable of utilizing a variety of gadgets, they aren't capable of creating new inventions.

The archer subclass of rogues seems to be a squishy ranged nuker/dps too.

any ideas?

Closest thing I can see as a Rogue for any modern shooter would be the TF2 Spy. There are other examples, but the backstabbin' rogue is a perfect fit for the TF2 spy.

Also, the base classes of MMORPGs are usually far more varied beyond just Warrior/Mage/Cleric/Rogue. Usually there's a pet class like a hunter (Sometimes a warlock/necromancer) as well as other tank classes such as a dark knight or paladin.

What would correspond to a mage?
I kind of think as dark knights or paladins as hybrids. Paladins for example is just a hybrid class between warrior and cleric.

A mage would probably be something like a sniper or a scout. Squishy, cannot take a lot of hits, but has the potential to deal the most damage.

I always thought that rogues were more of scouts and snipers????
The ranger is often a subclsas of the rogues, so they're not necessarily limited to melee.

any ideas?

are mages just determined by technology or more?