Gintama, Angel Beats! Recommendations
Both uses the combination of sociopathic comedy and anti-comedy as an entertainment.
Character dramatization are backstory reliant though tearjerking in sometime.
The OST of both series are almost the same.
Only difference is the themes and art-style, moe & anti-moe.
Both manage to incorporate hilarious slapstick yet touching moments at the same time, and are both set in a fantasy-surreal world.