A gladiator-styled fighter with a medieval fantasy look can fill the role of hero, rival or arena champion without waiting on custom modelling. This humanoid character gives fight-focused scenes a strong silhouette to build around.
Among Unity 3D assets, this one is a fantasy humanoid character that works with the Built-in Render Pipeline. It is not set up for URP or HDRP, so projects on those pipelines should weigh that before adding it. Projects that stay on Built-in can drop it into a scene without a pipeline mismatch.
Download Medieval Gladiator Warrior Character from Ultimate Game Assets and try this Unity Medieval Warrior Character in your own arena.