Hm, gonna give a try.
Since the model is heavily armored, it is good to use it as a tank hero, and my ideas were mainly an tank skills.
Will edit and provide a icon suggestions for the skill once arrived home (next 4 hour).
You might want to edit the MP usage because I don't know your MP scales, that will it be much or less.
Also it would be better for you to write the description by yourself as if my english skills fluctuates sometime.
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Fierce Slash
(Active)
Effect : The hero strikes the enemy with a great force, dealing high damage based on attack power and has additional chance of dealing stun, which lasts 3 seconds.
Level 1: 200% damage based on attack, 15% chance of dealing stun and consumes 20 MP.
Level 2: 300% damage based on attack, 20% chance of dealing stun and consumes 30 MP.
Level 3: 400% damage based on attack, 25% chance of dealing stun and consumes 40 MP.
4 seconds cooldown.
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Knockback
(Toggle)
Effect : Reflects attacker's damage to the attacker, each hit consumes 5 MP.
Level 1: Reflects 15% damage to the attacker.
Level 2: Reflects 22.5% damage to the attacker.
Level 3: Reflects 30% damage to the attacker.
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Deflect
(Passive)
Effect : Gives hero a chance to nullify damages from an attack.
Level 1: 5% chance
Level 2: 7.5% chance
Level 3: 10% chance
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Guardian Spirit
ULTIMATE (Active)
Effect : Triples defense point for 20 seconds, consumes 100 MP.
2 minute cooldown.