This article delves into an examination and analysis of leadership models within local government institutions in Indonesia, employing the conceptual framework of new institutionalism. We contend that informal local institutions within communities not only influence the behavior and identity of leaders as actors but, within the context of decentralization, have also undergone a process of reinstitutionalization regarding roles and functions, employing distinct patterns of appropriation. Employing an interpretive approach, this article focuses on phenomena within the management of local governance in the West Nusa Tenggara province. Data were collected through in-depth interviews, literature studies on local history, and online news searches. Through a case study of local governance in West Nusa Tenggara province, particularly Lombok, the article reveals that the Tuan Guru, an informal local institution in Lombok society, has experienced reinstitutionalization through vertical and horizontal appropriation. The conclusion drawn is that decentralization has created opportunities for informal institutions to re-establish their roles within formal governance through appropriation patterns.

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