Well, it could be about a Pokemon girl who has a change in her lifestyle. Maybe she starts to eat more of the delicious Pokemon - themed treats like Poke - puffs. As she consumes more, she gradually gains weight. For example, she might be so into the new Miltank milk - based desserts that she can't resist and starts to put on pounds.
Perhaps there's a Pokemon girl who gets a Pokemon that has the ability to create delicious but very fattening food. Every time the Pokemon uses its power, she ends up eating the food it creates. This continuous eating without much exercise causes her to gain weight. She could then struggle with her self - image and how her fellow Pokemon trainers perceive her.
Well, it could be about a girl in the Naruto universe who, perhaps due to a change in her lifestyle like eating more because she discovers some really delicious new foods in the Hidden Leaf Village. For example, she might find a new love for the ramen there and starts having it every day, which gradually leads to weight gain.
In a cat girl weight gain story, perhaps she has a magical encounter. A spell makes her have an insatiable appetite. She eats everything she can find. Her weight gain becomes quite noticeable. She then embarks on a journey to find a way to reverse it, meeting various interesting characters along the way.
Well, perhaps it could be about a neko girl who starts leading a very lazy lifestyle. She eats a lot of junk food and doesn't exercise. As a result, she begins to gain weight. Maybe she then has to deal with things like fitting into her old clothes or being teased by others, but eventually learns to embrace herself and make positive changes.
One reason could be a change in lifestyle. For example, if she used to be very active in the goth club scene, dancing all night, and then she has an injury or something that stops her from being so active, she may gain weight. Another reason could be a new hobby like baking goth - themed treats as I mentioned before. Also, a new relationship where her partner cooks a lot can lead to weight gain.
One reason could be overeating due to emotional issues. For example, if she has problems at home or with friends, she might turn to food for comfort. Another reason could be a lack of physical activity. Maybe she's too busy being mean and not focusing on taking care of her body. Also, it could be related to hormonal changes, which can sometimes cause unexpected weight gain.
Imagine a group of students living in a dormitory. They start ordering pizza every night while studying. And they also have a habit of sharing a big box of cookies during their breaks. Since they are so focused on their studies, they don't exercise much. Their mutual indulgence in junk food and lack of physical activity lead to them all gaining weight. This can be a plot where they later realize they need to change their habits for better health.
A person discovers a magical potion. They drink it and suddenly start to gain weight in a very healthy and aesthetically pleasing way. Their confidence soars as they transform.
Some of her Pokemon might be concerned. For example, a Chansey, which is known for being nurturing, could try to encourage her to eat healthier. It might bring her berries instead of the fatty treats she usually eats.
It could be Tenten. She's always been focused on her weapon training. But if she got distracted from her training routine, say she started spending more time with Neji and Lee at the dango shop, she might gain weight. She's not as physically active as before and is consuming more sugary treats.
The reasons for an Asian girl's weight gain can be various. Genetics might play a role. If her family has a tendency towards a slower metabolism or storing fat easily, she might be more likely to gain weight. Additionally, if she is on certain medications, some of them can have side effects that lead to weight gain. For example, some antidepressants or steroids can cause an increase in body weight.