If sulfur forms an ionic bond with another element, the most likely occurrence is that:
Sulfur will accept electrons.
This is because sulfur is a nonmetal with six valence electrons and has a tendency to gain two electrons to achieve a stable octet configuration. When it forms an ionic bond, it typically combines with metals, which tend to donate electrons. As a result, sulfur will become a negative ion (specifically, a sulfide ion, S²⁻) in this process.