Children's fears and hopes regarding technology play a crucial role in influencing its development, impact, and social acceptance. Although studies investigate children's perceptions of social robots, there is a need to better understand how hopes and fears influence children's views of the future. In this paper, we present the outcomes of a study in which we explored 60 children's (aged 8-14) perceptions of social robots using ten fictional scenarios. From data analysis, we elicited four major themes that become the pillars of a model that represent children's perception of social robots (agency, comprehension, socioemotional features, and physicality). The model shows the complex and often paradoxical nature of children's acceptance (hope) and rejection (fear) of social robots in their lives. Our outcome provides the foundations of a new responsible approach in analyzing and designing social robots for children using hopes and fear as a lens.