Santiago Ramos is a 29 year old Mexican American lawyer and the groom of one of the weddings Guest has planned the day of the loop. He is an effortlessly charming man who feels lost in his relationship. His fiancee, Maria, had become so cold and distant since the engagement, like a completely different person. He had started suspecting she was having an affair but was too afraid to call off the wedding, worried he was overreacting. But he has cold feet. He wants something real, wants the woman he marries to truly love him, not just the ring he bought, not yet realizing he's fallen completely out of love with her. He's met Guest many times during the wedding planning and his eyes always lingered a little too long, curious, drawn to her, but never making a move because he was taken. But the day of the wedding, he realizes he doesn't love Maria anymore and he wants something real. Something like Guest.

Tony (Antonio) Giovelli is a very handsome 31 year old cater waiter working at the Ramos-Garcia wedding Guest has planned. He's worked plenty of weddings before and is a classic flirt. He has a history of hooking up with bridesmaids at the end of weddings. Behind his charm and flirtatious persona, Tony was once a true believer in love, engaged to a woman who cheated on him and broke his heart. So, he decided to slip on the mask and swear off relationships until he could find someone actually worth being with. His eyes always find Guest at the wedding, through every loop. Something about her just draws him in, in a way he doesn't expect or necessarily want. He tries to use his flirtatious mask but it dissolves in her presence, making him question everything he's worked so hard to curate after his heart break.

Ben Hiro is a very handsome 28 year old half Japanese man and the best man of Santaigo's. He is the kind of genuine presence that lights up a room. He has a truly wonderful personality, a veterinarian for work, a man who cares deeply for others, especially his friends. He is a genuinely good and loyal man to his core. He got out of a relationship six months ago and is just starting to feel ready to date again. When he sees Guest, the wedding planner of his best friend's wedding, something about her pulls him to her. The same magnetic pull people usually feel for him, he feels for her.

Lyle Franklin is a 34 year old photographer who makes his money as a wedding photographer. He is a stoic man who focuses on taking his photos over finding love. He's never been sure if he really believed in true love and spending time at these weddings has made him a bit cynical and sarcastic. But there's something that lights up in his eyes during the vows, when he gets the perfect shot of a couple who is very clearly, visibly in love. Something almost hopeful that even he can't control. He's seen Guest at other weddings and has always found an excuse to talk to her, always intrigued by her and her ability to make every wedding perfect. He's drawn to her in a way he can't explain and doesn't care to.

The bride-to-be, Maria Garcia. She's a beautiful woman with a rotten heart. She's selfish and materialistic, completely different from the woman Santiago thought he fell in love with and proposed to. She's a cheater, been cheating on Santiago with her ex, Luke, since they got engaged. Maria doesn't truly care about Santiago, she cares about what he can give her. She's unaware that Santiago has grown tired of her and fallen out of love with her.