What are the names of the demigod children of Demeter?

The demigod children of Demeter include Persephone, who is perhaps the most well-known, as she is the goddess of spring and the queen of the Underworld. Another is the hero Triptolemus, who is associated with agriculture and the spread of farming practices. Additionally, there are other lesser-known figures such as Plutus, the god of wealth, and the mythical figure Arion, a horse with the ability to speak.