Well, Time to get back in the game now Bionifight Infinite has ended. But first...
Variation: Limited Invulnerability
Gear: Mechanized arms that can switch out his hands for twin energy cannons which fire Impact shots, but due to their potency, they need an hour of cooldown after a continuous usage until they can be used again, Spiked Greaves
Apperance: The first thing you might notice about Arsenal is that he appears to be mostly mechanical, with exposed gears and pistons on his limbs, exhaust pipes on his torso, and twin gun barrels protruding from his upper arms. His dull grey carapace is Industrial-looking and Practical.
Personality: Arsenal may seem intimidating at first, being more Machine than rahk, but he’s actually rather nice, and loves nothing more than hanging out with his friends after a day on the field. However, in battle, He is very trigger-happy and will gladly let loose on any foe that stands in his way.
Bio: Arsenal was created in the same batch of Kraata as Swarm, whom he considers a sister. An accident early on in life made him lose 75% of his original body, so the engineering class reconstructed him with a few “extras”.
Variation: Insect control
Gear: Twin Knives
Apperance: Swarm is a Lithe Rahkshi, clad in orange and black armour patterned in the likeness of a wasp. Her general armour design is very simple and smooth compared to her brethren.
Personality: Appropriate for her power, Swarm is an avid Insect lover, and usually leaves flowers outside her dorm window. She is also quite nice (oddly enough for a rahkshi), but hurt anyone close to her (Especially her brother), and she will not hesitate to unleash a swarm of angry bees on you.
Bio: Swarm was created in the same batch of Kraata as Arsenal, whom she considers a brother. Since then, they have always stuck close to each other.
I think something along the lines of these two Ideas has probably been done before. Apologies if their personalities are a bit generic, but I feel like the best thing to build a personality is to just go with whatever's natural through writing.
Also, if Arsenal's name sounds too silly, I can always change it to something more appropriate.