Concepts

 Friend A and Friend B, total opposites. Friend A is naive and trusting of everybody, while Friend B is paranoid and suspicious of everyone. Friend A: It's because of Friend B being cautious for the both of us that I can afford to trust everyone. Friend B: I'm cautious of everyone so that Friend A will never have to lose their trusting nature.

 Someone with extremely high regeneration lights uses highly destructive spells to destroy their enemies while barely surviving themselves.

 "Dude, you're so depressing." "Really?" "Yes. Literally every word you say sounds like you couldn't care less about dying." "...I see."

 A person looks down upon those who are direct with how they feel and what they say without reading the mood, but it is reading the mood that prevents this person from expressing themselves when they're hurt.

 In a world where it's survival of the fittest, two people form an unlikely friendship. Person A is average in strength and speed. Forms friendship with Person B because Person B seems slower than Person A, so if the need comes, Person A can leave Person B behind for whoever is attacking. Person B is unclear how much strength they possess. They appear helpless and cute, the kind of person you'd want to protect. This is, of course, an act. Person B acts this way in the name of self-preservation, calling on others' protective instincts to have them fight on behalf of Person B.

 Put the main character in a dress, with long hair and heels. Make them interested in fashion, makeup and flowers. Then, make them fall in love with a girl. By the end of the story, reveal that the main character was a guy all along.

 Long-tailed Manakins take on a "bad" student to dance with them. This is a symbiotic relationship. The bad student's dancing makes the original Manakin look much better in comparison, and the bad student gets to learn to dance better. Imagine that but in a group performance.