2746. Why do these five characters all seem so reflective? 囚 菌 臭 否 舌

They all look the same when reflected in a mirror!  

囚  SHUU - arrest, imprison, prisoner

菌  KIN - fungus, germ, bacteria

臭  SHUU, kusa(i) - foul smelling, smelling of ..

否  HI, ina - no, negative

舌  ZETSU, shita - tongue