Given the explanations provided, I rescind my previous comment.

Also, I've got so many ideas, I'm not sure which one to choose:

My first idea is a mute hunter, maybe a Deer Faunus, that uses a compound bow/double-bladed glaive. He's used to working alone, and has a semblance that allows him to see the world around him in black and white, with people and creatures identified in colours denoting their intentions. White is neutral, blue is a friend, pink is someone in love, red is an enemy etc with gold being a target he has deliberately selected for tracking purposes and Grimm showing up like they appear physically except with a mild glow. He can also identify their remaining aura by the intensity of their glow.

My second idea is an Atlesian military project: a cyborg. Son of an Atlesian weapon designer is heavily wounded, resulting in the loss of his arms and legs, and is given experimental robotic limbs with built-in weapon systems by his father. He can use hard-light blades for melee combat and built-in energy rifles for ranged attacks, both of which can be modified using internal dust distribution systems, or hard-light shields for defence. His semblance creates a rotating electromagnetic field around him, which is used to charge the robotics via magnetic induction and thusly can't be utilised outside of his body. Instead, he can release the power output limiters as a pseudo-semblance that increases his speed, strength and weapon damage but drains his internal power stores faster than he can recharge them. He can also overcharge his systems, which increases them even further but risks fairly serious damage to his robotic parts.

My third idea is a Wolf Faunus armed with a Battle Rifle/Hand-and-a-half sword, with a semblance that summons spectral wolves made of aura that he can fuse with to increases his speed, strength, senses and aggression. He was raised by criminal parents, ran away as a teenager and ended up leading a street gang of similar teens, where they lived by stealing valuable items and fighting off rival gangs. The group was nearly caught by the police after a huge fight broke out with another gang, but he gave himself up to let the others get away. To avoid prison, he accepted a deal to enroll at Beacon.