Searches for heavy quarks and other signatures with the ATLAS detector at the LHC

Given that the Standard Model is very successful in describing the nature and no clue is found on the scale of new physics, signature-based search covering a wide range of final states and topologies has been more important nowadays. Searches for fermionic top/bottom quark partners, referred to as vector-like quarks, have been performed in various final states with leptons, jets and missing transverse momentum (pT). Searches in final states with a high pT jet or boson recoiling against large missing energy are quite powerful for dark matter production. Long-lived, weakly-interacting particles predicted by various BSM models often lead to a signature with displaced decay vertices in ATLAS detector. This talk highlights ATLAS searches on vector-like quarks, dark matter and long-lived particles in LHC Run 1 data.