Trying to pinpoint a single set of tropes for Kanan and Hera is tricky because the fandom operates across two distinct emotional frequencies. The first, and probably the most pervasive, is the domestic AU. Fans are absolutely ravenous for fics where they get a quiet, peaceful life—raising Jacen, running a small farm or a mechanic shop, just existing without the constant Imperial threat. It's pure wish fulfillment, giving them the future the show couldn't. The other major lane is the angst-fest, heavily focused on the timeline around Kanan's sacrifice. You see a lot of 'Force Ghost Kanan' fics or 'what-if' scenarios where he survives, but is blinded or otherwise changed. Hera grappling with grief and single motherhood is a huge theme here.
Beyond that, there's a strong undercurrent of fics that explore the early days of their partnership, the slow, unspoken build from colleagues to something more. It's less about grand declarations and more about the intimacy of shared trust in the cockpit, the silent communication during a mission. You also get a surprising number of crossovers, especially with 'The Mandalorian' or other 'Star Wars' properties, imagining their dynamic influencing a new generation of rebels. Honestly, the variety speaks to how richly drawn their relationship was; it provides fodder for fluffy comfort reads and brutal emotional explorations alike.