Parental Engagement is an important factor in the success of students’ character education in schools. The objectives of the research are (1) testing the theoretical model of the effect of positive parenting and Agreeableness personality toward parental engagement in students’ character education through religiosity mediator, (2) testing the effect of exogenous variable toward endogenous variable directly and indirectly, (3) describing the types of parental engagement and school strategy to involve them in students’ character education. The research used mix-methods approach. The respondents were 210 parents of SD Muhammadiyah in Yogyakarta. The measuring tools used were parental engagement scale, positive parenting scale, Islamic religiosity scale, and agreeableness personality scale. An interview and a focus group discussion (FGD) were also conducted to parents and principals in order to collect data. The result of data analysis using SEMAMOS version 22.0 indicates that (1) the theoretical model of positive parenting and agreeableness personality toward parental engagement in students’ character education through religiosity mediator match or fit with the empirical data, (2) there is a significant positive effect of religiosity toward parental engagement, there is no significant positive effect by positive parenting toward parental engagement, there is significant positive effect by positive parenting toward religiosity, there is no significant positive effect by agreeableness toward parental engagement, there is significant positive effect by agreeableness toward religiosity, there is significant positive correlation between positive parenting and agreeableness, (3) the parental engagement are in the form of joining parents community in school, supporting character education program that is included in the task assigned to students at home and in school, attending school invitations, communicating and consulting with the class teachers, and becoming the source of introduction to different professions for students, and (4) the school strategies to engage parents in character education are: socializing the importance of character education, meeting the parents, cooperating with the parents in implementing character education program at home.