Samantha

"'You will make an excellent dolly!' -Samantha"

Design
Samantha is a female Gatomon missing her gloves, she is always seen in bright pink clothing, most often a dress and matching diaper. While physically week, she instead has an excellent mastery of hypnosis she utilizes to take control of the minds of everyone she looks into the eyes of.

Backstory
Samantha first appeared in Alone, where she was the leader of Toy Town. Her father Monzaemon had brought her The Alchemist she proceeded to hypnotize and immobilize into a new dolly. However, he was freed from her grasp when Syrus managed to trick her to look away long enough for him to steal The Alchemist.

Cubs in Care-A-Lot
This is the time when she finally decided to enact her true plans. She has the goal in mind to conquer everything. Turning all worlds in the multiverse into her own toy box full of cute dollies. Her first goal (outside of the Digital World) was Care-A-Lot, where she dethroned kind Arthur and took over the mind of Merlin. She then set up a Carebear conversion factory using a chemical compound she invented that would transform anyone who touched it into a Carebear Cousin, and make them completely obedient to her will. Eventually Syrus confronted her in the castle, and lost in battle to him. Syrus sent her back to Toy Town to deal with later.

Project Horizon
It's here that we begin to discover some of the sheer terror everyone has of her. The Rebirth Pirates in particular mention her quite a bit, calling her 'The Nightmare Child', and refusing to go to Toy Town accept to save their caption. Gatomon of the pirates claims to be related to Samantha, though this may just be something she says to keep her crew in line. The pirates also mention how Merlin is considered 'The Great Survivor' as he seems to be one of, if not the only person to escape from Samantha's wrath.

Later on as Syrus and co pass through Toy Town a second time, she meets up with them and begs Syrus to kill DaVoice who destroyed Toy Town. She also advises him to hurry, as she had been building an army to conquer Factorial City, and that they won't last long against DaVoice.

Syrus
Syrus is really the only person she has any interest in. Having defeated her twice over now, she swears revenge, but also respects him as an adversary.

Merlin
For a brief period of time she had control over Merlin, and theoretically is the one who turned him into a Care Bear Cousin. As such she may have knowledge on his lost past.