Small pool of contestants this time. In any case, closed for judging.
EDIT: Judgement is here!
Spoiler: Please don't hand out Intelligent Devices to random children.It's a magical girl's (or boy's) Fate! Presumably the set this is printed in would feature the child creature type, so I'm not too worried about the enchant child bit. This seems to be begging for a board wipe to be exiled with this; which begs the question: 'What happens when you cast a board wipe or fog effect and there are other creatures that would deal damage at the same time as the Child?
Spoiler: Fishy Gacha Rolls / Guitar HeroineFirst, let me say I am appreciative of the puns. This is both a magical girl, and a flip card. The Prowess encourages the casting of spells, which helps fuel the Gacha mechanic. Flipping over to Hagumi keeps Prowess, and allows the Gacha counters to be converted into something useful.
Spoiler: Burning Heart(h)It's a Flip card. It might be a magical girl, but it isn't made clear. Unfortunately, it doesn't quite work as you intend it to. With a flip card, it has two states, unflipped and flipped. When it is first played i enters the battlefield unflipped, thatis with the normal topside up top. When it becomes flipped the normal topside is now the bottom. Flipping a flip card while it is already flipped does nothing. To do what you are trying to do you would have to put in something like 'If you lose the flip, exile Firebrand Bearer and return it to the battlefield [unflipped] under {your control/its owner's control}' You technically wouldn't need to specify unflipped, but that would make things clearer, and who you return it to would change how good a target for various theft shenanigans.
Spoiler: Western Magical GirlShe-Ra is definitely a magical girl! I presume that She-Ra, Princess of Power has a white color indicator. The indestructible would carry over the turn when Adora transforms. As a 2/1 first-striker, Adora isn't all that bad. Transforming her into She-Ra upgrades her toughness and gives her Double-Strike. The second ability allows She-Ra to go up to a 6/6 (more with uncards).
Spoiler: The Results
Consolation Prize:Bucky's Hearth Tender/Firebrand Bearer
Third Place:ben-zayb's Boon of Mystic Fate
Second Place:Quiddle's Adora, Horde Defect/She-Ra Princess of Power
First Place:Dr.Gunsforhands' Bass Guitarist/Hagumi, 5-Star Bassist