This doesn't really match the old lore about Izuna
Izuna began his career in the Noxian military as a blacksmith. Athough he made decent weaponry and armor, the invention of hextech manufacturing techmaturgy combined with the militaries need for foot soldiers eventually led to him being drafted into the military armed forces. when Noxus invaded ionia he was sent on an expedition to conquer one of the many ionian villages. he expected to be fighting ionian warriors in combat, but when he arrived he found his comrades slaughtering defensless villagers. his initial fear of combat was quickly replaced by moral outrage and disgust at the Noxians cowardice and brutality, something inside him awoke that he never knew existed. he turned on his own comrades, killing them one by one, and as the Noxian troops attacked him, they slowely realized that something was very wrong. Izuna had never seen combat before in his life, and he had just single handedly destroyed an entire battalion of Noxian soldiers.
stats: typical fighter stats, leaning on the tanky side.
extreme courage: (innate passive)
for each percent health izuna is missing, he gains 0.3/0.5/0.7/0.9/1.1 armor and magic resist.
intimidating confidence: Q
for five seconds, izuna steals 15/18/21/24/27% movement speed from a target enemy and increases his damage against the target by 5/7/9/11/13%.
cooldown 6 seconds
unanticipated power: W
passive: izunas basic attacks convert 9/10/11/12/13% of his physical damage dealt and 15% of his ability power into a temporary shield that lasts for five seconds and can absorb a maximum of 60/100/140/180/220 (+0.5 per ability power) damage.
active: (can only use when shield is above 50% capacity) izuna deals 20/40/60/80/100 (+0.2 of his ability power) as magic damage to surrounding enemies per second over 4.5 seconds the duration of the dot increases by 1% for each percent of the enemies health that was missing at the time it was cast. he loses the passive shield bonus until the spell comes off cool down.
cooldown 12 seconds.
izuna sacrifices 3% of his current health to gain 25/35/45/55/65 bonus attack damage for 7 seconds. and apply grevious wounds which reduce enemy healing by 50% for 5 seconds.
cooldown 6 seconds
izuna instantly gains 0.4/0.5/0.6 attack damage, 0.4/0.5/0.6% attack speed, and 0.6/0.8/1% life steal for each percent of his maximum health he was missing at the time he cast it. lasts 13 seconds.
cooldown 80 seconds.