[hider=The Genius Physicist][list][*][u][b]Name:[/b][/u] Kiryu Sento
[*][u][b]Gender:[/b][/u] Male
[*][u][b]Appearance:[/b][/u] [url=https://cdn.discordapp.com/attachments/214609368186880000/1437771308917329991/Gv8brAN-LX05zKL1pOywktPRNk67FFEvhgnCPv9HfMG2ExxDY-8sRqGjilu3PPqR3br91QgN2pw4gNKVkzbPJL8eSeg2ye8l0I8RxjT81sK8Z63EYo4ZGD0JOQ5tm_AY2vDzUyUUUDq7Kz-0k0fjfy6wk1CAPPG76wOqFUFYPUY.png?ex=69147460&is=691322e0&hm=24a3fe966b0bc3f8be7e178669b0ae7f7dc86a961f088e31a43121df9f99977c]"Now, shall we begin the experiment?"[/url]
Sento is a fairly unassuming Japanese man in his mid-twenties, and his usual choice of clothing—a brown coat and ripped jeans—don't do much to set him apart from the crowd. However, after activating his Build Driver, Kiryu turns into [url=https://cdn.animenewsnetwork.com/thumbnails/max600x600/cms/news/119326/krbuild01.jpg]Kamen Rider Build[/url]. The appearance of his suit changes based on the Fullbottles he uses, but when using the Rabbit and Tank Fullbottles this would be considered the "default".
[*][u][b]Personality:[/b][/u] Sento is, at first glance, an egotistical genius whose confidence in his own abilities is nothing if not unshakeable. His manner of speaking can be blunt to a fault at times, which could quite easily be misconstrued as rudeness or callousness. On top of all that, the insatiable curiosity that he holds towards the unknown can easily lead to fixation and a ruthless pursuit of answers, which can itself lead to other problems if left unchecked.
But beneath that self-assured bravado is the heart of a hero. Though Sento is a scientist, his desire to create a better world in spite of the evils that thrive within it have pushed him further and further beyond his limits. He is a pacifist at heart and would rather defend than attack, but past experiences have led him to shoulder burdens upon himself so that others would not have to. Had he not encountered the reliable allies that pushed forward to fight with and by his side, though, it is likely that such an attitude would have ended with his eventual mental collapse.
To those that are his allies, though, the mask of egotism softens into something more akin to self-assuredness and reliability like no other. While he does poke fun at those close to him and might not hesitate to mess with them for entertainment when the mood is right, Sento understands the weight of what it means to be a hero and is willing to put himself on the line to see things through to the end.
[*][u][b]Brief History:[/b][/u] Kiryu Sento, otherwise known as Kamen Rider Build, uses the power of the Build Driver to fight for the sake of his world. In his timeline, Japan was split into three sections by the Pandora Wall, a byproduct of an incident involving the Pandora Box that turned the nation into three discrete entities, each vying for power in a divided land. Though his time as Build began with him fighting Smash—humans transformed into monsters by means of Nebula Gas—his journey has led him to fight enemy Kamen Riders, aliens, and even his own allies at times. All of this culminated in one final battle against the being that had caused all of this to begin with. Alongside his former enemies-turned-allies and a certain Banjou Ryuga, Sento emerged victorious, but at the cost of shifting into a worldline where the Pandora Wall—and, by extension, Sento himself—never existed, but with everyone he knew in his time now alive but bereft of memories of his original continuity.
All save the Banjou of his own timeline, whose own unique circumstances caused him to end up in this new timeline as well with his own memories still intact. Though said timeline is far from perfect in it's own right, the two continue to live on, regardless of what difficulties they face in this new world—though now absent the horrors they have lived through. Mostly.
[*][u][b]Universe of Origin:[/b][/u] Kamen Rider Build
[*][u][b]Equipment:[/b][/u] 
[list][*][url=https://cdn.discordapp.com/attachments/1437772857546506370/1437772870712561685/latest.png?ex=691475d4&is=69132454&hm=d113814db3bc86822bfb05bf864821b6d184b8ac5f28c2b6d1cb7e8c0c368937]Build Driver[/url]: A device that mounts to Sento's waist that, when loaded with two Fullbottles (or one of the few dual-slot Fullbottles), allows him to transform into Kamen Rider Build. The Fullbottles are modular and can be swapped at will to allow him to access a multitude of sub-forms if necessary. If two bottles are a "Best Match", using them at the same time increases their effectiveness and abilities accordingly.
While his suit is active, Sento gains increased strength, speed, and durability regardless of which Fullbottles he uses.
[*]Fullbottles: Containers that hold within them the distillation of "elements" of items that exist on Earth. They can, as a whole, be discretely separated into two categories: "Biotic" and "Abiotic", and the Build Driver can only slot one of each at a time (ignoring specialized alternative Fullbottles). Sento can also 'activate' and use the bottles without the Build Driver to augment his own abilities, if temporarily. At this point in time, Sento only has the Rabbit and Tank Fullbottles on hand; the rest were left behind when he was dragged out of his original (new) world.
[*][url=https://cdn.discordapp.com/attachments/1437772857546506370/1437773026249674822/latest.png?ex=691475f9&is=69132479&hm=5eb46ee1b691b9ec02d5585a7123041fb4cfeb2a0dbfcba73fbe62d38509efab]Drill Crusher[/url]: A combination drill/sword/gun that Sento can access more or less at will from the Build Driver. He can also use it while untransformed and, while somewhat unwieldy, can use the contents of a Fullbottle to affect it's capabilities.[/list]
[*][u][b]Abilities:[/b][/u] The largest factor to Sento's success as Build (and otherwise) is his intellect and talent across multiple scientific disciplines. Utilizing that has allowed him to design and create various inventions, including the upgrades that he and his companions use as they unravel the mysteries that once plagued his world. On top of that, he has shown the ability to quickly and efficiently wrap his head around things that [i]break[/i] those laws and repurpose those as he deems necessary.
Furthermore, his role as Kamen Rider Build has also honed him as a fighter, both in hand-to-hand combat and with various pieces of weaponry that he utilizes in combat. Though never formally trained (in the traditional sense), the innumerable life-or-death situations he has gone through have pushed his capabilities well beyond those of an everyday human.
[*][u][b]Other:[/b][/u] Taken post-series and all associated pieces of media.[/list][/hider]