It depends. If the portrayal of the yandere girlfriend is done in an interesting and nuanced way, it could be appealing. But if it's overly stereotypical or one-dimensional, then no.
A gift from her in a yandere manga can have multiple meanings. It could be a sign of the yandere's obsessive love, an attempt to control the situation, or a way to create drama and tension in the story. Sometimes, it might even be a red herring to mislead the reader.
The story of the Scarlet Witch manga can be seen in the following examples:
In Marvel Comics, the witch Emily Wenderlich was a woman with superpowers. She used to be an ordinary witch, but in an accident, she gained the ability to control magic.
As time passed, Emily West began to use her powers to fight against evil forces, including the Dark Magician Sorren and the Dark Wizard Bane. She worked with other superheroes such as Iron Man Tony Stark, Captain America Steve Roger, and Spiderman Peter Parker to fight various threats.
During a battle with Soran, Emily West discovered that she was not the only witch. There were others with similar superpowers. She decided to explore these superpowers and learn how to use them for justice.
In addition, Emily West also established a complicated relationship with other characters in the comic, such as Gale Gardner, the ally of Iron Man Tony Stark and Wonder Woman. These relationships and storylines continued to develop throughout the manga.
Well, such a girl is often obsessive and possessive. She might go to extreme lengths to keep the person she likes close to her, sometimes even using violence or threats.