S Tier's Wife (Unnamed)

S Tier's Wife was a superhero who tried to redeem S Tier with the power of love. She appeared in the Redemption arc.

She married S Tier on paper after only a few months of dating, and had the ceremony after. This was both to ensure anything that went wrong at the wedding ceremony wouldn't affect their legal marriage status, and as a manipulation tactic to ensure S Tier wouldn't defect back to villainy, since they're "already committed".

She died on her wedding day when S Tier tore her heart out during the vows, revealing they were not, in fact, redeemed or in love.

Relationships
She was likely a member of the Fairness Association, as S Tier is shown hanging out with Chad, a known member, during their stint as a hero.

She was in a romantic relationship with S Tier for a couple months before proposing to them. S Tier only entered the relationship to get revenge on her for even thinking she could redeem them with the power of love.

She had a potential romantic interest in another man who she "could have married", had she not decided to "fuck with" S Tier. He got her heart in the end.

Soft Canon
S Tier ensured that she was in love with them by the time of their marriage.