While he is initially self-conscious and bumbling, Takagi is a dedicated member of the Tokyo Police Force and shows promise as a good officer as the series progresses.  He is one of the few officers who trusts Conan's judgments the most, listening to him at case scenes to find important evidence and sometimes even letting Conan take the lead in their investigation (the case with Sato handcuffed to the wrong suspect in the bathroom being a good example).