One of the best is 'The Dark Knight Returns'. It presents an aged Batman coming out of retirement in a gritty, alternate future of the DC Multiverse. It's a story that challenges the traditional view of superheroes and their place in society.
It's not a straightforward yes or no. Different DC Comics story arcs might present Robin in various ways regarding sexuality. Sometimes it's left ambiguous to allow for different reader interpretations.
The age of Robin in DC Comics isn't fixed. Different story arcs and reboots present him at different ages. Generally, though, he's often shown as a young adult or a teenager in his mid to late teens.
The Batman Who Laughs is extremely popular. He combines the intelligence and skills of Batman with the insanity of the Joker. His twisted nature and his dark plans make him a fascinating character in fanfiction.
One interesting concept is the twisted versions of well - known heroes. For example, a Batman who has completely given in to darkness and uses extreme and unethical methods to 'protect' Gotham. Another is the alternate versions of the Justice League where their powers are corrupted and they become more of a threat than protectors.
Robin's death in DC Comics varies depending on the specific storyline. Sometimes, it's due to a powerful villain's attack or a risky mission gone wrong.
Dark Multiverse Stories can act as cautionary tales for the main DC Universe. They show what could go wrong if certain events or character developments take a dark turn.
In regular DC fanfiction, the heroes generally uphold their values and the storylines follow a more positive or at least morally - guided path. However, Dark Multiverse fanfiction often breaks these moral boundaries. It might show a Superman who doesn't care about human lives or a Batman who uses torture to get information. The settings are also more dystopian and the tone is much darker in Dark Multiverse fanfiction.