Another aspect could be in his physical appearance and actions. He may lose his appetite, so he no longer enjoys his favorite ramen as much. He could also seem less energetic during training, often zoning out and being less focused than before. His eyes might lose their usual spark, always looking a bit dull and lifeless.
One possible reason could be the loss of his friends. In the Naruto universe, his friends are his most precious. If he were to lose some of them in a really tragic way, like Sasuke turning truly evil and being killed while trying to destroy the village, it could plunge him into severe depression. Another reason might be the weight of his unfulfilled dreams. Naruto has always dreamed of a world of true peace, but if in fanfiction he constantly faces setbacks in achieving this, like new wars breaking out despite his efforts, it could lead to depression.
In a fanfic, one possible cause could be the loss of his loved ones. If he were to lose Sasuke again, this time perhaps permanently, it could send him into a deep depression. He's always been so focused on bringing Sasuke back, and if that hope is completely dashed, it would be a huge blow.
Iruka sensei, who has always been like a father figure to Naruto, could offer his unconditional love and support. He could share stories from Naruto's past, reminding him of how far he has come and how strong he is. Sasuke could also play a role. Despite their past differences, Sasuke could show Naruto that he's not alone in his struggles. They could train together and Sasuke could share his own experiences of dealing with inner demons, which might give Naruto some hope.
His depression could be shown through his behavior. He might stop being as energetic as he usually is. For instance, he won't be the first one to jump into a new adventure or come up with a crazy plan like before.
A plot could involve Bulma facing personal losses in her relationships. Maybe she has a falling - out with her friends or family, and this causes her to spiral into severe depression. She could then start to isolate herself from the people she loves, and the story could focus on her journey to recovery with the help of those who care about her.
In certain fanfictions, Goku's depression is manifested in his dreams. He could have nightmares about his failures or the destruction he couldn't prevent. These dreams haunt him during his waking hours, making him more withdrawn and less likely to engage in his normal activities.
I'm sorry, but I'm not aware of specific 'Bulma severe depression fanfic' works. Fanfic can vary greatly in content and availability. You might try searching on fanfic - specific websites like Archive of Our Own or FanFiction.net, where you can filter through Dragon Ball - related fanfictions to see if there are any that touch on such themes in a respectful and appropriate way.
In fiction, depression is often portrayed through a character's internal monologue. They might express feelings of hopelessness, like 'I see no end to this grayness.' Authors may also show it physically, such as a character losing appetite or having trouble sleeping. Another way is through social withdrawal, where the character isolates themselves from friends and family.
Often, they are portrayed as strong in their own way. Even in a submissive role, they show strength in being able to embrace their desires and be true to their kinks. For instance, a woman might be depicted as fearlessly exploring her submissive side.
To effectively portray Ruby's depression in a fanfic, it's important to focus on her internal monologue. For example, she might constantly doubt her decisions and second - guess herself. You can show her losing interest in things she used to love, like training or eating her favorite cookies. Her interactions with others could also change. Instead of being the enthusiastic leader, she might be withdrawn and short - tempered.