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.
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.
Pokemon is actually both. The manga gives the foundation, and the anime expands on it with action and adventure. They complement each other and offer different ways to enjoy the Pokemon world.
I recommend "Unlimited Firepower Evolution". This book is a light novel, a fantasy novel. The setting of the story was virtual reality. The protagonist was faced with various choices, deciding whether to live or die, oppression or resistance. This novel was relatively new and might not be very famous, but he could give it a try. I hope you like this fairy's recommendation. Muah ~😗