Sorry , but i MASSIVELY disagree as well. Belinda is a really (REALLY) good unit to have. Raising iris is ofc important , but u could have done it at any other point in time. Belinda is a cheap (esp if cr-ed) witch with good dps , and great utility.
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There are many characters that are related to each other in the game. Take iris and camilla (sisters). The 2 plat princesses are cousins , and sybilla is the prince's cousin. Vincent (the gold vamp hunter) also has a daughter that is an event unit if i remember correctly. Lyla is Condrad's daughter if i remember correctly as well...and so on