I'm not sure specifically which 'Tunnel Story' Kamina tells without more context. It could be a fictional adventure story set in a tunnel, perhaps involving mystery, danger or discovery.
Often, these fanfics explore the deep bond between Kamina and Simon. It could be about their adventures together, with a lot of action and the signature over - the - top spirit of Gurren Lagann.
In the Battle Through the Heavens, Qing Lin's final strength was at the Dou Zong class.
Qing Lin was an original character in the novel. She was a servant girl of the Desert Metal Mercenary Company. She had the physique of a snake person and a magical beast symbiotic. She could subdue the Ancient Heavenly Snake with the Triple Jade-Green Snake Flower Pupils. She was brought to the Central Plains by the Northern Protector of the 'Sky Serpent Mansion' Lu Man. She was sold to the Thousand Gold Association for auction. After which, she was bought by Xiao Yan for 37 million gold coins and became Xiao Yan's servant girl. With Xiao Yan's help, Qing Lin's strength continued to rise until she finally reached the Dou Zong class.
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Love and adventure could be common themes. Given the nature of the characters, their relationship might be explored in the context of the exciting world they inhabit, with themes of love developing between them as they face various challenges together.
One popular kamina crossover fanfiction might be one where Kamina crosses over into the world of 'Fullmetal Alchemist'. In this story, Kamina's bold personality could contrast with the more reserved characters in 'Fullmetal Alchemist' like Edward and Alphonse. His motivational speeches might inspire the characters in that world to take more risks in their search for the Philosopher's Stone.
One common theme could be adventure. Since they are often in an action - packed anime setting, fanfics might continue their adventures together. Another could be romance, exploring the relationship between Kamina and Yoko in more depth.
One great Gurren Lagann Simon x Kamina fanfiction is 'The Bond Beyond Drills'. It beautifully explores their relationship as they face challenges in the post - apocalyptic world. It delves deep into how Simon looks up to Kamina and how Kamina, in turn, sees Simon's potential.