Wo de Yi Jie Zhi Lu

Spiritual beasts are magical animals or other humanoid things that have affinity with the cultivator. Typically, they form a contract and the beast could then be summoned. It's not unlike the mechanism in Shin Megami Tensei or Persona games. These beasts are usually intended to be fierce, to be used as a last resort weapon, such that contracting a strong beast brings prestige, even, to the family.

Sometimes however, the beasts "lose all their power" and revert to a cute form that the protagonist keeps as a pet, sometimes not knowing their power at all.

Personally, I find this plot mechanic annoying, but some might find it endearing.

Xianxia, directly translated to 'immortal heroes' comprises a number of popular genres including 'Cultivation', is a genre of Chinese fantasy heavily inspired by Taoism and influenced by Chinese mythology, Chan Buddhism, Chinese martial arts, traditional Chinese medicine, Chinese folk religion, Chinese alchemy and other traditional Chinese elements.

Protagonists are usually "cultivators" who seek to become immortal beings called xian. Along the way, they attain eternal life, supernatural powers, and incredible levels of strength. The fictional cultivation practiced in xianxia is heavily based on the real-life meditation practice qigong.

The stories usually include elements such as gods, immortals, yaoguai, ghosts, monsters, magical treasures, immortal items, medicinal pills, and the like. They often take place in a "cultivation world" where cultivators engage in fierce and usually deadly struggles to acquire the resources they need to grow stronger. Oftentimes, the initial setting is reminiscent of ancient China, but the stories usually become cosmic in nature, with the protagonists attaining godlike abilities, sometimes creating their own planets, galaxies or universes. While the primary focus is action and adventure, there are also romance-heavy stories.

Description taken from the wikipedia page about Xianxia subgenre.

Anime where the premise is leveling up or cultivating in a martial arts system.

𝙍𝙀𝙂𝙐𝙇𝘼𝙍 𝙐𝙋𝘿𝘼𝙏𝙀𝙎 | 𝙌𝙐𝘼𝙇𝙄𝙏𝙔 𝙎𝙀𝙇𝙀𝘾𝙏𝙄𝙊𝙉 | 𝙑𝙄𝙎𝙄𝙏 𝙋𝙍𝙊𝙁𝙄𝙇𝙀 𝙁𝙊𝙍 𝙈𝙊𝙍𝙀
Anime where the main character transmigrates into a new world. Transmigrates could be through reincarnation, time skip, traveling between worlds etc. I can guarantee you haven't seen at least one isekai anime in this list, and if you and I need to be banned from the isekai theme.

𝙍𝙀𝙂𝙐𝙇𝘼𝙍 𝙐𝙋𝘿𝘼𝙏𝙀𝙎 | 𝙌𝙐𝘼𝙇𝙄𝙏𝙔 𝙎𝙀𝙇𝙀𝘾𝙏𝙄𝙊𝙉 | 𝙑𝙄𝙎𝙄𝙏 𝙋𝙍𝙊𝙁𝙄𝙇𝙀 𝙁𝙊𝙍 𝙈𝙊𝙍𝙀
Isekai anime that have a twist…