He definitely seems to have some of Asterion's affinity for water. The convenient pocket of air in the chapel, the spring he found. During their visit to the beach, Storm finds seashells with ease and with enough affection, you see a scene where a school of fish crowd around Storm, which matches with a line from one of the random startup poems about Asterion: "When saltwater touched his ankles shells would spring from the sand and fish would swarm and swim by in honor of Poseidon's ichor."