I have never managed to see Miki’s attack increase reflected, I have tried different situations attacking with different heroes and I have never seen an increase in numbers when Miki is activated.
Can someone explain to me where and when Miki’s increased attack against heroes or events and even against titans is reflected.
In the damage numbers 
His special affects NORMAL attacks only & hence doesn’t get shown on the in-battle information screen as green “+ xyz” above the attack stat. Instead its listed as an active effect.
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What guvnor said…he only boosts tile damage, with no chance to miss! He is incredibly powerful and the best attack booster for titans.
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For reference: