This trope seems both "misused" and too narrowly defined. Rather than being limited to a characteristic of a person, this trope should probably refer to an entity or event that brings hope to a hopeless situation. Or, perhaps, the "characteristic of a person" version could be a sub-trope of the more general trope for an event or organization that brings hope to a hopeless (or nearly hopeless) situation.
This trope seems both "misused" and too narrowly defined. Rather than being limited to a characteristic of a person, this trope should probably refer to an entity or event that brings hope to a hopeless situation. Or, perhaps, the "characteristic of a person" version could be a sub-trope of the more general trope for an event or organization that brings hope to a hopeless (or nearly hopeless) situation.