Sweetheart de Megazone was Mizeleingzelo`s grandmotherīs grandmother who died at quite young age. She got her name after the sweet nature of hers that appeared already on the very first days of her pretty short life and an endless ability to forgive was that what made her very special among her sisters and brothers.

Unlike many other de Megazone mice - she was soft tan-furred and her light, blonde hair fell softer on her shoulders than hair of a de Megazone mouse usually. Her red eyes also made her look more like a "normal" Martian mouse - rather than the future Queen of the de Megazone family. Having her whole appearance to be softly feminine, she woke among the males the need to protect her from all bad. That wasn`t enough anyway on that moment when she tried to create a decent peace between the age long rival families the de Megazones and the VanWhams. Young Derekk VanWham, Vinnie`s grandfather`s grandfather, raped Sweetheart.
Anybody else of the de Megazone ladies of that time could have prevented that. Only Sweetheart who always bended in front of so called "destiny," couldn`t resist and fight back to get herself freed from what was going to happen. She got pregnant because of that unwanted intercourse and gave birth to a baby girl, which was not forgiven by the rest of the de Megazone family which wanted her to have an abortion. Many VanWhams lost their life at first when Derekk had done the horrors to Sweetheart but even more of them, including Derekk himself too, lost their lives when Sweetheart died after giving birth to her half VanWham daughter, Ironheart. Sweetheart herself couldn`t carry anger or hatred towards Derekk and forgave his act even if no-one else in her family didn`t.