Mera Mera no Mi

The Mera Mera no Mi, also known as the Mera Mera Fruit, is a Logia type Devil Fruit that allows to user to transform into fire at will as well as control it. "Meramera" is the noise a fire makes when it burns. In the 4kids adaption, it is called the Flare Flare Fruit. It was eaten by Portgas D. Ace.

Usage
The fruit's bestowed powers, as used by Ace, have been used for a variety of ways. Ace notably uses them usually either to fight or to propel his raft. The named techniques that are used by Ace that involve the Devil Fruit are as follows:


 * Heat Haze: Ace shoots a stream of fire from the palm of his hand. This was first seen being used to stop Smoker from catching Luffy.


 * Fire Fist: Ace turns his fist into flames and launches it as a column of fire at his target. This attack is incredibly powerful that it is able to plow through several ships in one shot. It is apparently the source of Ace's alias of "Fire Fist Ace." This is called Heat Fist in the 4kids dub.


 * Fire Gun: Pointing the index and middle fingers of both hands at an opponent like guns, Ace turns his fingertips into flames and shoots bullets made of fire at them. This technique was first seen when Ace retaliated against Van Auger's attack.


 * Fire Lump: Ace amasses a large amount of flames around his body in preparation for an attack. This is apparently the prerequisite technique before Ace can use Fire Tower.


 * Fire Tower: Used following Flame Lump. Ace shoots the collected flames straight upward, destroying a target above him. This technique and it's prerequisite technique were first seen when Jesus Burgess threw a motel at Ace.


 * Firefly Fire Fireball: Ace creates many small fireballs that float around an enemy before flying into them all at once, burning them. The idea behind this attack's name is that before he attacks with them, the small fireballs look like fireflies in the air. This was first seen being used in Ace's battle against Blackbeard after Blackbeard performed Liberation.


 * Fire Lance: Ace launches two long lances made of fire at his opponent's chest. This was first seen being used against Blackbeard when Ace was being dragged by Blackbeard's power.


 * Fire Cross: Ace puts his index fingers together in a cross shape before launching a cross-shaped column of flame directly at his opponent. This was first seen being against Blackbeard after Ace attacked Blackbeard with Fire Lance.


 * The Great Punishment of Fire: Supernova: Ace's ultimate technique. Ace creates a gigantic fireball resembling the sun and hurls it at his opponent to try to obliterate them. This was first seen being used during the final moments of Ace and Blackbeard's battle.