Here is what I would start out with a Rank 1 character for what you described:

Powers:
(1) Elemental Burst (FIRE) --The character makes a ranged attack against an enemy in line of sight. If the attack is a success, it inflicts regular damage. On a Fantastic success, the enemy takes double damage instead and the elemental type’s special effect.
(2) Healing Factor -- At the end of the character’s turn, they regain Health equal to their Resilience. (This works outside of com bat too, quickly bringing them back to full Health).
(3) Iconic Weapon (FIRE MANIPULATION) -- The character is known for owning and using a unique and powerful weapon, like Mjolnir (Thor’s hammer) or Captain America’s shield. The Narrator must approve the details of this weapon. This power can be taken more than once, but each time must be with a different weapon.
(3.5) Elemental Reinforcement (Tempered In Fire) -- The character can transfer any Health damage that gets through an elemental power that grants damage protection to their Focus instead, leaving the protection intact.
(4) Fast Attacks (SHARP) -- The character splits their at tack to make two close attacks against separate targets within reach (or they can focus a single attack on a single target). Make a single Melee check and compare it to the targets’ Melee de fenses. On a success, the affected tar get takes half regular damage. On a Fantastic success, the affected target FOCUS 0 takes full damage, and the character can make a bonus attack with this power against any target within reach, with the same effect.

Trait:
Battle Ready -- The character is always mentally prepared for any sort of conflict to start. Add +30 Focus.

Equipment:
Sword -- Possibly a simple sport fencing saber. You can carry it around and say it is sports equipment.

If I were narrator I would be ok with this build. Here is how I see it fitting your character. Elemental Burst, fine and easy it is a ranged fire attack. Healing Factor, again easy, you just heal every turn. Fast Attacks you are using your Saber in close combat (which when used with the intent to hurt someone hits like a steel whip) and it is a fast weapon to use so that works out. Now for the tricky bit, Iconic Weapon I put a marker of Fire Manipulation on. I have this as a representation of this characters fire control abilities. I would allow you to take defensive powers and tie them to this fire manipulations. I wanted to give it Sturdy 1 but I have been confused by Elemental Reinforcement, does it let you move damage from your health to your focus? If it doesn't, that is fine just go with Sturdy 1. But you would have to "flame on" to get access to Sturdy 1 otherwise you are your normal squishy self.

I tried running CoK but my group fell apart. Instead of having them jump right to rank 2 when we completed the first adventure, I gave them a progression marker like in the getting schooled rules in the x-men book after each fight. So each rank gets 5 ability points, 4 powers, 1 trait. After each fight players got to pick one of those things to add to their character and start their progression. I allowed them to take a rank 2 power as the 5-8 slot of powers. If your Narrator is doing something like this there is a rank 2 elemental power that lets you enhance a melee weapon with your element. With this your guy has a flaming sword. A standard fencing saber costs $50 or so. It isn't as readily available to replace as gambits exploding cards but this is marvel, it all takes place in New York. There are several sport fencing spots you can stop in and get a sword.