Maybe his dark secret could be related to his past trauma before he got his powers. For example, he might have witnessed something truly horrifying that made him the way he is.
One interesting 'dark boy story' could be about a boy who discovers a hidden, spooky attic in an old house. He finds strange artifacts and starts having vivid nightmares related to them.
In some 'dark boy stories', there might be a mentor figure, like an old man who has some knowledge about the strange events that the boy is experiencing. For example, the old man might know the history of a haunted place that the boy has stumbled upon.
The 'Beast Boy Dark Side' in fanfiction can lead to some intense storylines. For example, he might struggle with his identity as he succumbs to his darker instincts. This could cause rifts in his relationships with the other Titans. It also gives room for exploring his internal conflicts, like how he tries to resist the pull of his dark side while still being part of a team that expects him to be the fun - loving Beast Boy.
A Dark Element boy could choose a variety of English names, depending on his personal preferences and cultural background. Here are some possible choices:
1 Dante
2 Dante Bending
3zephyrus black
4 phoenix black
5 Shadow Knight
6 Dark Lord
7 Shadow King
8 black darkness
9 dark night
10 Black Dinner
< Gu Zhenren > was a novel with Gu worms as its core, it described the main character Gu Yue Fang Yuan's demonic path cultivation journey. The main character was cold and ruthless, and he was bent on becoming stronger. This novel might suit your preference for dark avatars and cold boys.
One common theme is the loss of innocence. In stories like 'Lord of the Flies', the boys start off innocent but as the situation on the island deteriorates, they lose that innocence through violence and savagery.
In fanfiction, Beast Boy's dark past often involves his time before joining the Titans. Maybe his experiences as an experiment, being turned into different animals against his will. This could have led to a lot of psychological trauma for him.
One common theme is the loss of innocence. Boys in these stories often face harsh realities that force them to grow up quickly and lose their childish naivete.