I think Heroic tsunamj when slotted in another pet(Hapiness Bonus) doesn't give the right statz in the description.
So the pet has 30%damage/50 main stat/20crit/20%hp

I found that the pet didnt give addional hp(compared to the same 20%hp buff on leto)
And...Gives lower damage than Hiberio's 25%damage...(1.9k str bd set hiberio gives 6k damage while hero tsunami gives 5.8k damage)