This study aimed to: 1) review the implementation of the Child Mentoring Program of PPA Domby Kid's Hope 2 Yogyakarta, 2) examine the process of inculcating character values of PPA Domby Kid's Hope 2 Yogyakarta, 3) find out the supporting and inhibiting factors in inculcating character values in Child Mentoring Program of PPA Domby Kid's Hope 2 Yogyakarta. This study employed a descriptive qualitative approach. Data were collected by observation, interview, documentation, and study of documents. Data analysis was conducted using the Miles and Huberman Interractive Model, which consisted of data collection, condensation, data display, and conclusion drawing. The validity of the data was obtained by using triangulation of the source. The results of the study showed that: 1) Child Mentoring Program of PPA Domby Kid's Hope 2 Yogyakarta using Holistic Integralistic Approach which develops all child's potencies either physical, cognitive, socio-emotional, and spiritual, 2) the implementation of character values was integrated with every mentoring activity by using habituation, exemplary, reward, and punishment, and civilizing Senyum, Sapa, Salam dan Terimakasih (3S-T). The main character values that were embedded in Domby Kid's Hope 2 foster children were religious, honest, disciplined, independent, tolerant, hard-working, caring, and respectful of others. In addition, 3) inhibiting factors that emerged according to this study were foster children's characters that have been formed before, time constraints, the attitude of foster children such as laziness, lack of fighting spirit, and inconsistencies, as well as mentor changes. Meanwhile, the support of foster children's parents, the commitment of the volunteers, and the spirit of mentoring children to be better were supporting factors in the inculcation of the character values in foster children.