Aractur
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Yup
From a quick Google search Poseidon has power over any body of water which include the creatures within, had the ability to create storms earthquakes floods and droughts and line other gods superhuman strength along with the ability to teleport and shapeshift. So what I would start with would be enhanced capabilities like strength endurance speed and all other things that would apply to all demigods/gods first then go for powers of Poseidon.
Give him his weakest power first then when mastered or mastered to a certain level give him the next weakest
Married?
Loli?
Favourite drink slushie?
An inch is roughly 2.5 cm
Is there supposed to be a , between investigation and rituals