Alternate Character Interpretation: Hiroshi. Besides being a deadbeat, is it possible that he abandoned Hatchin because that was the most nicest/responsible thing he could do for her? Given what we know about him (he's a jerkass, Really Gets Around, and a criminal) and how the story became a "Shaggy Dog" Story at the end when looking for him became pointless, as he just ups and leaves, one could make the argument that, perhaps, Hatchin would be better off.
Catharsis Factor: When Hana beats Maria after she's kicked out of the house by the latter.
Darkness-Induced Audience Apathy: 90% of the supporting cast are assholes that screw each other and the two leads over and the two leads themselves constantly fight. It's like they drive from one bad situation to another, never accomplishing anything or improving their situation.
Genius Bonus: The date Hatchin leaves with Michiko, March 17, is the feast day of St Gertrude of Nivelles, patron saint of travelers.
Germans Love David Hasselhoff: The series was an Acclaimed Flop in Japan but did better internationally through word of mouth. It eventually even made it onto Toonami, which made it even more successful. It helps that many black and Latino fans like the series for being set in a Brazilian-inspired country.
Girl-Show Ghetto: Averted. Despite being a josei anime with female leads and having an emphasis on friendship and family, it's quite well known. It doesn't hurt that it is one of the few non-fantasy anime set outside of Japan, especially one with brown and black characters at that. The series even aired on Toonami, which mostly focuses on action shonen.
Moral Event Horizon: Hana's foster father crosses it in episode 2 when he tries to kill Hana for insurance money.
The Woobie: Hatchin was this prior to meeting Michiko as she was treated like garbage by her foster family.
WTH, Casting Agency?: Some fans feel that Monica Rial was miscast as Michiko in the English dub, feeling her performance and mannerisms were forced. There are also those who feel that casting her was a missed opportunity to have a black actress do the role, considering Michiko is a Afro-Brazilian counterpart.