He can be made playable by marrying him, or asking him to move in.
Salty has mastered the scuba diving skill. He also has five points in the collecting hidden skill, four points in the mooch hidden skill and one point in the homework hidden skill.
Whereas the other four premade mermaid townies provide Mermadic Kelp, Salty's "Evil" personality trait results in him providing fake Mermadic Kelp to Sims. The kelp will be labeled the same as real Mermadic Kelp, but it will not glow when placed somewhere in the home lot of a Sim and, when ingested, will cause a Sim to become nauseous instead of transforming them in to a mermaid.