 If you liked Witch Hunter Robin |  ...then you might like Bungou Stray Dogs 2nd Season |
both about agencies that work to make the world a better place. both have fairly dense and self pitying main characters; who are orphans; that have mentors that work to make them better people, in spite of their own questionable past.
report Recommended by wolfbreed699
Both are focused on a detective agency dealing suspicious stuff specially supernatural stuff and lots of action in them as well too.
report Recommended by Disapeared_Ghost