Poseidon look at the being beside him
His older brother, Hades
Hades like always has that aura of darkness around him and this silent dignity, solemn power that sets him apart from any of the other Olympians.
He is the most mysterious and the most powerful of all the Olympians. He rarely goes to the Council but when he does, just by sitting there, his presence is commanding and menacing.
As he is the big brother, there is this authority around him that even make Poseidon scared sometimes.
Zeus is the arrogant one. And each time Hades deal with Zeus, hades does not even need to use power to subdue his youngest brother.
Just play off his paranoia and arrogance. But Hades never had coveted the throne of Olympus. No one knows why
Maybe he is grateful that Zeus saved them from their father. Maybe, it is because he never cares for the power of Olympus
No one really knows.