Real Name: Sebastian Caine
Occupation: Student, adventurer
Legal Status: American citizen with no criminal record
Other aliases: Mr. Invisible
Place of Birth: Philadelphia, Pennsylvania
Marital Status: Single
Known Relatives: Nathaniel Caine (father), Noelle Peterson Caine (mother), Samantha Caine (sister)
Group Affiliation: X-Men (Alpha Squadron)
Base of Operations: Xavier Institute
History: Sebastian Caine was a thirteen year old boy living in Philadelphia, Pennsylvania who led a normal life until his mutant power of invisibility emerged. It first emerged when one morning he woke to discover his body was invisible. With his visible pajamas covering an unseen body, his shocked older sister, Samantha, remarked that he was a "hollow boy." After a few terrifying minutes he returned to visibility. His father, Nathaniel, is a noted geneticist and immediately realized Sebastian was a mutant. Over the next few months, Sebastian discovered that although he could consciously make himself invisible, on several occasions he uncontrollably became invisible. Shortly after turning fourteen this began to happen more frequently.
In response, Sebastian's mother, Noelle, began homeschooling him so he wouldn't possibly turn invisible in front of people in school. One day Sebastian spontaneously became invisible and no matter how much he tried he couldn't make himself visible again. After several days of analysis by Sebastian's father and his colleagues, it was concluded that Sebastian's invisibility was now permanent.
In order for him to pass as a normal person, Nathaniel Caine created a latex head-mask for Sebastian to wear with his lack of visible eyes hidden behind sunglasses along with gloves. Since, the mask can appear to be a humanoid skin without an interior, Sebastian embraced the nickname "hollow boy". He also surprisedly came to terms with his condition rather quickly, however he did desire to have contact with other people besides his family. He especially wanted to be near other mutants.
Sebastian's father contacted Professor Charles Xavier. Professor Xavier agreed to take on Sebastian as a student at the Xavier Institute for Higher Learning, a school for mutants. Regarding the school as a big heroic adventure, Sebastian immediately requested to go off on missions like Xavier's other X-Men students. His parents even agreed to this, so he was placed in the Alpha Squadron training squad. Hollow Boy has since proven himself to be one of the most valuable members of the X-Men team.
Hair: Brown (invisible)
Eyes: Blue (invisible)
Know Superhuman Powers: Sebastian Caine is a mutant who has been rendered permanently invisible as a result of his entire cellular structure being phased out of quantum sync with the mutually interactive frequency of the visible universe. Simply put, all the particles of his body vibrate at a different frequency pattern than normal matter. Because of that, when visible light particles contacts Sebastian's body, they are not reflected, but instead pass directly through him without any distortion. This is because the photons pass through the spaces between the atoms of his body without physically interacting with them in any way. The result is total invisibility from the visible spectrum, as Sebastian's cells now posses the refractive index of air.
Because visible light passes through him and therefore cannot be perceived by his eyes, Sebastian can no longer see along the visible light spectrum. However, he has not been rendered blind as one might expect. Instead, the altered quantum frequency of the rods and cones of his retinas, enables Sebastian's eyes to perceive ultraviolet and infrared light wavelengths. As a result, he is able to see in a higher spectrum of light, in which depth perception and surface detail are clearly rendered. However, his vision is monochromatic, allowing him only to see in shades of black, gray, and white. Sebastian can, however, see exceptionally well at night and in low-visibility scenarios such as heavy fog or thick smoke.