One common theme is vulnerability. Since Magnus is often seen as a powerful warlock, these fics explore what happens when that power is stripped away, even if just temporarily, due to injury or emotional pain.
Emotional hurt is also quite prevalent. For example, his relationships with the Shadowhunters might cause him pain. Maybe a betrayal by someone he trusted, like Alec or one of the other characters, which can lead to a lot of angst in the fanfiction.
One popular 'hurt Magnus Bane fanfiction' is 'Bleeding Hearts' on Archive of Our Own. It delves deep into a scenario where Magnus is physically and emotionally hurt. The author does a great job of exploring his vulnerability while still maintaining his strong character traits.
You can try Archive of Our Own (AO3). It has a vast collection of fanfictions, and there are likely many Magnus Bane hurt - themed ones. Just use the search function and type in relevant keywords like 'Magnus Bane' and 'hurt' to narrow down your search.
One common theme is isolation. Magnus might be isolated due to his unique powers or past traumas, which causes him pain. For example, in some fics, his immortality makes him feel alone.
One common theme is the relationship between Magnus and those around him. His partner, whether it's Alec or someone else in some fan interpretations, might be shown as being very protective. Another theme could be the magical implications. Since Magnus is a powerful warlock, there could be speculations about how his magic is affected during pregnancy. And of course, there's the theme of anticipation and preparation for the new life, which might include things like creating a safe space in his magical lair for the baby.
One common theme is his magic and power. Writers often explore how Magnus uses his magic in different situations. Another theme is his relationships, like his romantic relationships or friendships. His backstory also features a lot, especially his experiences growing up as a warlock.
Characteristics of good Magnus Bane love fanfiction include a deep exploration of his emotions. Since he has a long life and many love experiences, the fanfiction should show his growth in love over time. It also needs to have a good writing style, vivid descriptions of the settings where his love stories take place, whether it's a magical club or an ancient magical place.
One great Magnus Bane x OC fanfiction is 'A Shadowhunter's Heart'. It beautifully weaves the story of an original character into the Shadowhunter world. The relationship between Magnus and the OC is developed in a very natural way, with lots of emotional depth. Another one is 'Magnus and the Newcomer'. It has an interesting plot where the OC has a unique power that attracts Magnus. They go on various adventures together, and the chemistry between them is palpable.