Starfire:The second of the three children of the Royal Family of Tamaran. When her planet was attacked and devastated by the Gordanians, Starfire's elder sister Blackfire made a peace settlement with the invaders by giving them her younger sibling as a slave. Unfortunately for her captors, Starfire, while apparently rather naive and gentle by Tamaranian standards, was too much for them to handle, breaking loose and flying to Earth. There, she had an... interesting... meeting with the other future Teen Titans, who came to her defense against the Gordanians. Like all her species, Starfire can fly, is super strong, is extremely durable, and can hurl energy blasts called "starbolts".
Who would win a Death Battle?
base by ~Death-Driver-5000
On the other hand her other powers like telep, invisibility and shapeshifting give her better versatility and possibilities of winning.
If Megan had strength advantage, it would be minimal.
If she went into a physical battle, she would be at disadvantage because of starfire energy based powers.
Martians have a weakness for fire.
Starfire energy produces heat
Starfire can't only throw starbolts, she can pretty much irradiate heat from all of her body.
Any physicall contact between them would burn Megan
and that trumps any advantage physical strenght migth give to Megan.
Megan's best asset and hope are invisibility, telepathy and shapeshifiting and if possible intangibility. She can't physically touch Starfire without hurting herself (I think).
Without it, Starfire would burn her to ashes or at least KO her with the explosive power of he blasts.
Starfire melts metal at contact with her skin.
She easily melts glass and burns bad guys to ahses.
Her hair is on fire
Oh, one more thing worth noting, we're not working with the New 52
before you pointed out the "Martians are often depicted as being as powerful as Kryptonians" comment.
Then Megan has no strenght feats at all,
which means she doesn't have any advantage in that field at all,
nor in speed which means that your previous comment is competely irrelevant.
Also, even in the animate version, starbolts created explosion, and every explosion creates fire (plasma), even if it is for a brift moment.
Oh, one more detail. Fire and plasma are not the same thing. One is a chemical reaction created by rapid oxidization in the presence of heat or something else that would cause it to ignite, plasma is ionized gas and one of the four states of matter.
Also, in Young Justice, Martian Manhunter also lacks of the strenght feats required to say he has kryptonian strenght.
By definition, while not every plasma is a fire, every fire is a plasma, or contains plasma.
And also anything with enough heat to produce a plasma, has more than enough heat to produce a fire. (In the presence of oxygen and our atmosphere is rich in it)
Starbolts produce both thermal and explosive results on contact, from Miss Martian perspective, Starfire starbolts plasma explosions would be indistinguishable from fire as they would have the same effects (light, color, heat), and would produce a fire, if they hit anything flammable.
Also, as has been mentioned: The "weakness to fire" is a purely mental effect. Martians don't fear laser blasts or explosions either - it's really just that seeing (or believing to see) large quantities of "something burning" causes them to break down, and as psychic shapeshifters, mental damage is physical damage.
Sure, Starfire can set stuff on fire, but that means she can use MMs weakness only indirectly - she needs something to fuel the fire, because her blasts don't have the same effect.
And MM of either season can and does use large-scale telekinesis, even in concert with her near-invisibility.
So, in the end, it depends on the battlefield. If there's enough stuff to burn (like, in a forest), Starfire wins by setting everything on fire. If they're in a desert or similar place, Miss Martian can turn invisible and wittle Starfire down with ranged telekinesis attacks (or simply fry her mind, in case of second season MM).
On the other hand- Starfire doesn't have mental blocks.
Miss Martian via mind rape.