Leptoquarks - hypothetical particles motivated by quark-lepton unification - have recently been under the spotlight. TeV-scale leptoquarks have a rich phenomenology both at intensity and energy frontiers including present and proposed future colliders. However, they also pose a model-building challenge since they typically violate accidental symmetries of the Standard Model, such as the baryon number. In this talk, I will discuss several aspects of leptoquark physics based on my recent work in this direction.