So, in this continuity, Grant has no powers, per the reboot following Guildfall. Part of my plan involves this:
http://arrow.wikia.com/wiki/Mirakuru Long story short, it'll give me Enhanced Speed, strength, senses, reflexes, and rapid cell regeneration. However, The Mirakuru drug has at least two known side effects which is heightened aggression and Schizophrenia. Basically, he'd have visual and auditory hallucinations, and rages so intense, he'd develop tremors in his hands and body, depending on intensity.