Sentinel (BNHA x OC)

2: First Day of Class

As Yaze approached the classroom door, he paused for a moment to gather his thoughts. Despite his years of experience as a Hero, stepping into the role of educator felt like a whole new challenge. He straightened his posture, steeling himself for the task ahead.

With a steady breath, Yaze pushed open the door and entered the classroom, greeted by the curious gazes of his students. The room buzzed with anticipation as the students whispered amongst themselves, their excitement palpable in the air.

Yaze's glowing red eyes swept over the room, taking in the faces of the young Heroes-in-training before him. He could sense a mix of apprehension and curiosity in their expressions, mirroring his own feelings about the lesson ahead.

Without hesitation, Yaze made his way to the front of the classroom, the sound of his footsteps echoing softly against the polished floor. As he stood before the eager students, he felt a surge of determination wash over him.

"No need to waste time. Let us begin, shall we?" Yaze addressed his students with his deep, gravelly voice. "You may refer to me as Rushito-sensei or Sentinel-sensei." Yaze wrote his name on the board. "I am aware that you have been taught the basics of science during your time in middle school. Biology, geology, physics, chemistry. But given that this is the Hero course, I figured that those kinds of subjects would be almost useless to you. So, instead of wasting time repeating useless information out of a textbook for you to regurgitate on your next exam and then forget about for the rest of your life, I am going to be spending this valuable class time teaching you about something that could possibly help you in your future careers as Heroes.

"As you're all aware, Quirks are a fundamental aspect of our society, deeply rooted in our genetic makeup," Yaze began, his tone matter-of-fact as he addressed the class. "But what exactly determines whether you'll inherit a Quirk, and if so, what kind of Quirk you'll have?"

He paused, allowing the question to sink in before continuing. "Quirks are a result of genetic mutations--a process by which the DNA sequences in our cells undergo unforseen changes during replication, leading to the emergence of unique abilities," Yaze explained, his words precise and straightforward. "These mutations can occur spontaneously or be inherited from one or both parents."

Yaze gestured to the chalkboard, where he had already written "GENETIC MUTATIONS" in bold letters. "Now, let's break it down," he continued, his gaze sweeping over the room. "When genetic mutations occur, they can affect the genes responsible for determining our Quirks. This can result in a wide range of outcomes."

"First, there's the possibility of inheriting the same Quirk as one of your parents," Yaze stated, his voice unwavering. "This is known as a direct inheritance and occurs when the genes responsible for the Quirk are passed down from parent to child."

"Alternatively, you could inherit a combination of Quirks from both parents," Yaze continued, his tone remaining steady. "In this case, the genes from each parent interact in unique ways, leading to the emergence of a new, hybrid Quirk."

Yaze paused, allowing the information to sink in before proceeding. "However, genetic mutations can also result in the emergence of entirely new Quirks--ones that bear no resemblance to those of either parent," he explained, his words clear and concise. "These mutations are unpredictable and can lead to the development of truly unique abilities. Yours truly is a result of this Quirk mutation."

He glanced around the room, meeting each student's gaze with a steady intensity. "And finally, there's the possibility of not inheriting a Quirk at all," Yaze stated, his voice firm. "This occurs when the genetic makeup does not include the genes responsible for Quirks, leading to what we call being Quirkless. This occurs in about 20% of the human population, as you all know."

Yaze's explanation was straightforward and practical, laying the groundwork for a deeper understanding of the genetic mechanisms that underpin quirks and their inheritance.

"So," Yaze continued, "the name of the game when it comes to Quirks is genetic mutations. In most middle schools they don't bother with teaching you the details of how this occurs, just that they do. So, to avoid lecturing you on things you already know, let us delve into the different ways a genetic mutation can occur during the DNA replication process."

"Indeed," Yaze concurred, nodding in agreement with his own statement. "Genetic mutations are the driving force behind Quirks, and understanding their mechanisms is essential for grasping the intricacies of our abilities."

He approached the chalkboard once more, his movements deliberate as he picked up a stick of chalk. "When it comes to DNA replication, there are several ways in which genetic mutations can occur," Yaze explained, his voice steady and composed. "Let's break them down."

Yaze began to sketch out diagrams and equations, each line and curve representing a key aspect of the DNA replication process. "First, there's the possibility of a substitution mutation," he stated, pointing to a specific section of the diagram. "This occurs when one nucleotide is replaced by another, resulting in a change in the genetic code."

"Next, we have insertion and deletion mutations," Yaze continued, his gaze focused as he elaborated on each point. "These occur when nucleotides are either added to or removed from the DNA sequence, leading to shifts in the reading frame and potential alterations in the resulting protein."

He paused, allowing the information to sink in before proceeding. "Then, there's the possibility of a duplication mutation," Yaze stated, his tone unwavering. "This occurs when a segment of DNA is copied multiple times, resulting in an increase in the number of copies of a particular gene."

Yaze glanced around the room, noting the focused expressions of his students as they absorbed the lesson. "Finally, there's the possibility of a frameshift mutation," he explained, his voice clear and concise. "This occurs when nucleotides are inserted or deleted in multiples other than three, leading to a shift in the reading frame and potentially altering the entire sequence of amino acids. Write all this down, I expect you to know these things for your next exam."

With each explanation, Yaze provided examples and illustrations, ensuring that his students had a clear understanding of the different types of genetic mutations and their potential consequences.

"Now that we've covered the basics, I can assure you that the rest my classes will not be this boring. We will spend the rest of the year exploring the science behind each others Quirks, analyzing and breaking down exactly how your bodies manage the incredible feats they are capable of."

A certain green-haired boy sitting in the front of the class perked up when Yaze mention the word "analyze."

"That will be all from me today. You can spend the rest of this class period socializing amongst yourselves. If you have any questions about today's material, you may come see me in my office after classes."

And with that, Yaze successfully finished his first class and left class 1-A feeling triumphant.