Fire & Thunder (ファイア ＆ ポット・オブ, Faia & Sandā) are twins who act as Kilik Rung's Weapon partners. They are known as Demon Pots (魔壺 Matsubo in Japanese), although in Weapon form they actually take on the form of large gauntlets. Despite their age, they are still used and are incredibly effective in battle. They are also Earth Shamans, being able to hear the voice of the Earth. They are currently members of the elite Shibusen student unit, Spartoi.
Even though they are very powerful Weapons they are still only children. Obviously, they are inquisitive and easily distracted. More often than not, they do not realize that they are supposed to be serious in some situations, and always remain playful and innocent. They share Kirikou's carefree and laidback attitude to most things, and are always cheerful and looking for fun. They are surprisingly tough for their age, and do not show fear when fighting with Kirikou. However, they can still be spooked when things get too violent, which causes them to cry and run to Kirikou or the nearest person for protection, which show that they are still heavily dependent on others and are defenceless on their own.
Like most young brothers and sisters, they quarrel a lot and can be impatient, no matter how serious the situation is. This is shown during the operation to capture Baba Yaga's Castle against Arachnophobia (manga). In conducting this mission they nearly ruin Kirikou's disguise in front of Mosquito, through arguing while still being an integral part of the disguise. Also, due to their playfulness, they easily fall under the influence of Artifact Soldier Morubi's technique.
Despite these setbacks, Fire and Thunder are actually quite serious at times, especially when it comes to their abilities as Earth Shamans. They have deep ties to nature and are shown to express concern, even sadness, when they feel nature's pain from being polluted. Their feelings can be quite intense if nature is heavily affected by something, which may make them emotional in some situations.
Due to their young age, they do not speak. Being rather in sync with each other, there are not that many differences in their individual personalities. They do not even act differently or look different when they switch genders in the Book of Eibon (although by looking at their facial expressions, Fire seems to be the bolder of the two, whilst Thunder is a bit more sensitive).
Fire and Thunder are young small twins, befitting their young age in comparison to the other characters within the series. Both have a dark skin complexion and facial features consisting of large blue eyes, rosy cheeks and mid-length blonde hair framing their faces. They also share the same clothing, composed of a striped sleeveless top worn under white dungarees, and a cap. However, Fire's cap is orange and his top features alternating red and white stripes, whereas Thunder's cap is yellow and her top features alternating yellow and white stripes.
As of their later introduction into DWMA's Spartoi unit, their clothing changes drastically, as they adopt the groups signature uniforms. Both now wear a white dress shirt/blouse with a blue, sailor-style collar and a black necktie and blue pants. Alongside this, their original caps have been replaced with striped tuques (beanies). Their souls are not shown, however, in the anime, it is hinted that Fire's soul is red, and Thunder's soul is yellow, befitting their respective elemental properties.
Although they appear to be identical twins, it is later revealed that Fire is actually male, whereas Thunder is female. This is made evident when they transform into their adult forms through Kim's magic. In this form, Fire takes on the form of a young boy with chin-length blonde hair with (possibly) red tips. An elaborate marking in the shape of a fireball is emblazoned on one side of his hair, with a similar tattoo on his right shoulder. He has small but profound tear drop-shaped markings beneath each of his eyes and has three short vertical lines marked between his eyes. He also wears a scarf that seems to be made of fire. There are also what appears to be vents located on some parts of his body. Three are seen on each of his pectoral muscles, three on each of his shoulders, and three on the back of each of his hands. He also wears long metal bracelets on each arm. The bottom half of his body is obscured by flames which are attached to Kirikou's right arm.
Thunder becomes a young girl dressed in a (probably) yellow crop top which is attached to a hood that goes over her head and hangs down and curves round in a loop, with some segments of the hood separated and floating in place. She seems to wear a hat beneath the hood. Possibly yellow markings can be seen on the edges of her eyes and short streaks can be seen beneath them also. She has two sleek yellow lines tattooed on her shoulder. She wears elaborate decorative sleeves that extend outward and curve into the air similar to her hood, with some parts floating detached. The bottom half of her body is engulfed with electricity and is attached to Kirikou's left arm.
In Weapon form, they adopt the shape of two grey ornately decorated large boxing-gloves, or more accurately 'glove-shaped pots.' However, they only slightly resemble pots, the resemblance mostly more evident around the gloves' openings, which look like the mouths of pots. They have metal knuckle plates which have their respective names inscribed on them in black italics. Also on these plates is the slight 'human' factor in their design, the same large, doe-shaped eyes, though it is unknown if these eyes can display emotions in the way that Soul Eater's Weapon form does.
- In Chapter 15 of the manga, apparent previous designs of Pot of Fire and Pot of Thunder are seen alongside Kirikou. Drastically different to their recent designs, they are two young light-skinned women, one with dark tied up hair, one with short light hair. Both are wearing robe-like dresses and have tribal markings present beneath their eyes. In the anime version of the same scene, these designs are not used, and Fire and Thunder are in their recent designs.
- Along with the Thompson Sisters, Fire and Thunder are one of the few Weapons that fight as a pair.
- In Volume 18 of the Soul Eater manga (which contained the Spartoi's adventures through the Book of Eibon), Atsushi Ōkubo created a horse-racing style table of the Soul Eater characters who have had their genders switched, and made a race as to who is the most lustful out of them all in a 'Lust Race.' Fire and Thunder were given a racehorse name, called Fire Thunder. Their popularity level was 14.
- Unlike other weapons, when they transform, they stay fully clothed.
|E.A.T Students||Black☆Star • Death the Kid • Elizabeth Thompson • Harvar D. Éclair • Hero • Kilik Rung • Maka Albarn • Ox Ford • Patricia Thompson • Fire and Thunder • Soul "Eater" Evans • Tsubaki Nakatsukasa • Kim Diehl • Jacqueline O'Lantern Dupré• Tom • CronaAnime • RagnarokAnime • Akane☆Hoshi • Clay Sizemore • Elizabeth Thompson|
|N.O.T Students||Anya Hepburn • Mai Thi Hoàng • Kana Altair • Meme Tatane • Tsugumi Harudori •Hao •Raid • Aaron • Ao Hoshino|
|Former Students||CronaManga • RagnarokManga|