JoJo no Kimyou na Bouken (TV), Shingeki no Kyojin Recommendations
Two popular anime where the settings are memorable, as it would deal with the how characters faced battles amongst others and themselves due to times of joy, adventure, defeat and agony.
Both have a sense of utter suspense and terror. Both have a sense of predator and prey via Eren Vs. the Kyojin and Dio vs Jojo
Both mainstream and have other 'life' forms protecting their users.