Plato was a philosopher, not a Greek god.
the greek god of lost souls is hades.
Plato called the planet Areos aster, or "star of Ares" after the Greek god of war. Mars would eventually be named for the Roman god of war, Mars.
Alcyone was the Greek goddes who lost her husband at sea.
Plato is not considered a god; he was a famous ancient Greek philosopher known for his contributions to Western philosophy. He founded the Academy in Athens and was a student of Socrates. Plato's writings, particularly his dialogues, have had a significant influence on philosophy and intellectual thought throughout history.
It was named after Roman God of Underworld
No, he is in Greece. Sometimes Olympus.
Actually it was a girl who lost her child. Demeter lost her daughter Persephone to Hades.
he is the god of war, and when people lost a war, they are in Ares' debt
No.
Hermes is blamed for lost things. So he might possibly be the god of lost things.
In Plato's dialogues, "Mars" is not mentioned specifically. However, he did believe in a cosmology that included celestial bodies as divine, eternal and representative of perfection. Mars' identification by the Romans with the Greek god Ares may have aligned with this cosmic order and harmony Plato envisioned.