In general, quotations are used for titles of novels. Underlining is not a common way to indicate a novel. This is a standard convention in writing and publishing.
A line from 'Jane Eyre' such as 'I care for myself. The more solitary, the more friendless, the more unsustained I am, the more I will respect myself.' This shows Jane's struggle for self - respect and independence in the face of many hardships, including poverty and social inequality.
Writing quotations in a story involves capturing the essence of the character's speech. Make it vivid and engaging. Ensure the quotations add depth and authenticity to the narrative. Sometimes, a well-placed quotation can be a turning point or reveal hidden emotions.
Typically, novels are italicized. This is a common convention to distinguish them from regular text. Underlining is less common for novels, and quotations are more often used for shorter works like short stories or articles.
It could also be about a human character in the Pokemon world who is jealous. Maybe a trainer is jealous of another trainer's stronger Pokemon team. They see their rival's powerful and rare Pokemon and wish they had the same. This can lead to interesting storylines where the jealous trainer tries to catch better Pokemon or train harder to compete.
A simple plot could be that Naruto is invited to a party in the world of High School DxD. Rias sees Naruto getting along really well with Koneko. Since Koneko is one of her servants, Rias gets jealous. Naruto, in turn, notices that Rias is being a bit too friendly with Sasuke who has also somehow ended up in this world. So Naruto gets jealous too. This starts a chain of events where they both try to outdo each other in getting the attention of their respective 'rivals' attention in a rather childish but funny way.