Natsume Yuujinchou, Nurarihyon no Mago Recommendations
In both anime "youkai" play a keyrole. In both anime as well the maincharacter would like to hide the fact that he can see youkai/is part of a youkai family (In Natsume from his friends and family and in Nurarihyon from his friends)
Even thought Natsume is a slice of life another and Nurarihyon is an action anime, if you like 1 you like both for real.
Both series are focused on a protagonist who serves as a bridge between the youkai and human worlds and works to keep harmful youkai from disturbing the human world while receiving support from amicable youkai and spiritually gifted humans. NuraMago is more action oriented, but both are centred on themes of friendship, interdependence, and the supernatural all the same.
Both shows deal with youkai (spirits) and a lot of them. In Natsume there's a contract with spirits which was inherited by his grandmother and in Nurarihyon no Mago the main character is the heir of a youkai family.
They both evolve around Yokai. Their protagonist's, at first, dont want to accept that they live a life around them and try to shun the role that they are destined to follow. However, in time, they are unsure whether they hate yokai or not.
Bot deal with youkai/ayakashi, a young boy who can transform into a youkai and lead his ayakashi-army. These animes are not visually similar but the story is.
This is like Natsume Yuujinchou but with more action.
Beautiful art focusing on the relationship between humans and youkais, If you want to watch a slice of life go to Natsume Yuujinchou, if you want a little more action watch Nurarihyon no Mago.