One popular trope could be the 'friends - to - lovers' trope. Maybe they start as colleagues or friends, and then gradually their relationship deepens into love. Another might be the 'hurt/comfort' trope, where either Ellie or Alec is in some sort of distress, and the other provides comfort and support, which then leads to a romantic connection.
You can try searching on popular fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfictions from various fandoms, and there's a good chance you'll find some 'Ellie loves Alec Hardy' fanfictions there.
I highly recommend 'The Silent Understanding'. It's a short but sweet fanfiction that beautifully portrays the unspoken understanding between Hardy and Miller. They don't need many words to communicate their thoughts and feelings to each other in this story. Another good one is 'Side by Side' which shows them standing by each other through thick and thin, whether it's in the face of a dangerous criminal or personal hardships.
One great Alec Hardy and Ellie Miller fanfiction is 'The Unspoken Bond'. It delves deep into their complex relationship, exploring how they rely on each other during tough cases. Another is 'A New Beginning' which focuses on them starting a new chapter in their lives outside of work. And 'The Healing Process' shows how they help each other heal from past traumas.
Ellie could be a new superhero in training. Maybe she has some sort of power related to energy manipulation. She looks up to Peter and Wade and wants to learn from them. So she gets involved in their adventures and gradually becomes an important part of their team.
They could also have a moment of friendship while exploring new places. For instance, they visit a hidden magical realm that neither of them has been to before. They share their excitement and fears during this adventure, relying on each other for support and protection, which deepens their friendship.
One possible fanfiction could be about Jane and Alec's early days as vampires in the Twilight universe. Maybe it could explore how they came to be part of the Volturi and their initial reactions to the power and the strict rules there.
They are popular in fanfiction because they both have such strong and distinct personalities. Alec is the stoic and responsible leader, while Clary is the brave and creative new addition to the Shadowhunter world. Their interactions can be full of tension, drama, and also the potential for great friendship or more, which is very appealing to write about.
No, it is not ethical. Writing sexual fanfiction about a real person invades their privacy and can be considered a form of objectification. Ellie Kemper, like any individual, has the right to be respected and not have her image used inappropriately in such fictional and often salacious works.
A common theme is survival. Given the post - apocalyptic setting she's often in, many fanfictions focus on how Ellie survives against all odds. Another theme is friendship. Ellie forms strong bonds with other characters, and that's often explored. For example, her relationship with Joel. Also, self - discovery is a theme. As she grows and experiences new things, she learns more about herself.