Keel

Kiel was first introduced in chapter 131 of the web novel as a slave owned by the Slave Merchant in Melromarc's Castle Town. He is described as a young man around the age of 10 with dog-like features. When Naofumi tells Raphtalia to choose anyone he recognizes from her village and Kiel is the first. At first he doesn't recognize her because of her grown up appearance, but when she recounts the time he was looking for a pretty shell to give "Father" for his birthday so he dived into the ocean and almost drowned but was saved by Sadina as well as the time he accidentally ate a poison mushroom he found in the field, messed up her stomach, and hid to avoid being scolded so when she, Raphtalia, found him she was told to keep it a secret including that he had even wet his pants. After all was said he immediately acknowledged who she was. After having an unconvincing conversation with Raphtalia, Kiel agrees to become Naofumi's slave with the hope of returning to the village. Although she identifies as male, in chapter 137 it is revealed that he is actually a she. She rebuts with "father said that a man is a man if he thinks he is a man no matter what" but the revelation still throws her into moderate confusion. Kiel wasn’t meant to be an important character, however the personality she was given overlapped with another male character that was already firmly planned to be made down the road, so the author decided to give ‘him’ a little "quirk". She is presumed to be the "Guardian of Divine (crepe) Tree" in the Christmas Special.

Personality
Kiel can be bratty and whining, when wanting food from Naofumi. Despite how she acts, she helps bring together the slaves, and acts as a sort of leader. I thought she was growing to be a gluttonous battle maniac, but she was able to cook as well, showing a girly aspect. Kiel has been shown to be a charismatic person by nature. Her actions are shown to be too erratic.

Human
She is initially described as a young man around the age of 10 with dog-like features, however as she levels and her appearance ages as well as her being verified to be female she is made out to be more of a tomboy who could easily pass as a pretty boy.

Dog Form
She looks exactly like a puppy. As for breed, she looks like a Siberian Husky. She is a loincloth-clad puppy walking on two legs.

Kielberus
This form is of a dog with three heads. That of Cerberus, the guardian of hell. Her form isn't particularly large. Since the base is Kiel, it still looks like a wolf cub-like Cerberus. Looking from afar, her outer appearance is still relatively cute. She turned into what she feared to obtain strength, the Cerberus demon that destroyed her village during the wave. She thought something like strength = evoking fear. She’s really fast. Her weaknesses are being unable to look away from sweets, and being weak to lullabies.

Background
Throughout her life Kiel was raised as a boy, her father treated Keil like his son, and told her that gender was a state of mind.

Two months before the first wave, Kiel was looking for a pretty shell to give Rafatalia's father for his birthday so she dived into the ocean. She almost drowned, so Sadina jumped in to rescue her.

She also, accidentally ate a poison mushroom she found in the field, it messed up her stomach, and she hid to avoid being scolded. She told Raphatalia to keep it a secret when she found her. She even wet her pants.

Abilities
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Kiel has the talent, for transformation, so she was taught by Sadina. She says that while transforming using magic, her senses are sharper and her body is lighter and easier to move in.

Kiel’s level is on the higher side. But she hasn’t achieved overwhelming strength like Raphtalia. She learned the basics of Chi later than the rest, so you could say she’s a step behind.

Sickle Skills
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 * Soul Ripper (ソウルリッパー)

Chronology
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The Rising of the Shield Hero
Devil of Shield Arc c1-78

Cal Mira Island Arc c78-114

Spirit Turtle Arc c115-130

Slave Supremacy Arc c131-203

Kiel was purchased by Naofumi. c131

On a trip to the beach, Naofumi and the others saw that Keil's chest was covered in a loincloth, and discover she was in fact a girl. c137

Gives Naofumi shit about him sounding all rapey when explaining the difference between men and women. c138

Begins pedaling with Naofumi and Raphtalia and she receives a set of masculine armor for possible future battles as well as a cute one piece to help boost sells. c139

She, Taniko, and the mass of other slaves are found to be hoarding monster eggs they found while training. She and Taniko begg Naofumi to allow the village to keep them and he agrees. c143

While training with fellow slaves Kiel acts a bit too reckless and gets hit by an attack from behind. Luckily, Raphtalia realized and was able to save them, but from that experience, Kiel and many of the other slaves became more cautions when fighting and started formulating battle formations and strategies. They also began to respect Naofumi more for protecting them like he usually does. When he is able to class up he chooses to follow the same path as Raphtalia and Firo, using Firo's ahoge to gain superior stats in almost every field when compared to other class up choices, because she wants to become as strong as she can possibly be even if it forfeits her choice in the direction of her class up. c144

When she classed up, a smoke screen came out and covered the area and Kiel's stats rose significantly although they were slightly lower than Raphtalia and Firo's from when they classed up. c145

New 7 Deadly Sins c204-357

As punishment for assisting the cursed Noafumi, Kiel was ordered to take the form of an ordinary girl from then on, loincloths were prohibited, she had to wear the clothes that Imia provided, go peddling like that. In addition, she was assigned to gather as many fans as Firo, and she was to remain as a girl until she did. c290

Towards the Legend Arc c357-378

Side Stories
The Christmas of Shield Hero c379-385

The Valentine of Shield Hero c386-402

The White Day of Shield Hero c403-409

The Reset of The Spear Hero Gaiden
Loop 1 to 3 - Tutorial Arc c410-414

Loop 4 - Silt Welt Arc c415-455

Loop 5 - Melromarc Arc c456-574

Loop 6 - Foburei Arc c575-current }}

Trivia

 * Kiel wasn't meant to be an important character, however the personality the author gave him overlapped with another male character he planned to make down the road, so he decided to give ‘him’ a little… quirk. (Sex change)