Any paradigm -- functional, declarative, imperative, procedural, object-oriented, atbp. Share naman mga features na nagustuhan niyo or tumatak sainyo in any PL's? (or its implementation).
For me, it would be
High-order functions (functional, dynamic)
Closures
First class function
Lambda
Proper tail calls functional, Lua)
RAII (C++) - guaranteed deterministic destruction
Native concurrency support
Type inference
This is both out of curiosity and to gather data. I'm designing a language pero wala na akong maisip na ideas to make it different hahah