I have to say I'm annoyed I didn't know about this earlier, because Here is what I might have chosen:
For family link, I would have gone for one of these two.
[] Mafalda and her family.
Mafalda, being the only girl in your family near your age, was your best friend growing up. When she and Luna had their row, you choose to side with blood, and the two of you were all the closer for it. Auntie Leonie dotes over the two of you together, and Tristram's always full of a quiet rage you that you can't help but shiver from. Their world is so different from The Burrow…
Traits: Weasley, Pureblood Connections, Deceit II, Proud, Worldly, Burrow Outcast
Abilities: Dark Arts improved to P (Poor). Wandlore improved to D (Dreadful). Dark Arts set as starting Affinity and Focus.
Dark Arts & Hanging with cousin Mafalda would have been fun.
[] Charlie Weasley, dragon tamer.
Your other family members were cool, but Charlie tamed dragons. Dragons. No. Think about it. Dragons. One time, he told your family he let you touch a dragon egg—but, between you and him, he let you ride a dragon hatchling on its first flight. He's so cool. Sometimes people give you weird looks when you talk about how dragons are. That's okay. Those people are weird and you're so cool you got to ride a dragon before you started Hogwarts.
Traits: Weasley, Dragon Tamer I, Care for Magical Creatures III, Creature Person, Worldly, Oddball
Abilities: Flying improved to Acceptable (A) or P (Poor) {pending later choice}. Flying selected as starting Affinity and Focus.
The character description alone is enough.
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For trait pick, here is what I would have gone with:
[] Egyptian Spells
From Bill, you've learned the basics of the new wanded school of Egyptian magic. You learn a number of Egyptian hexes, jinxes and charms that are not present in the curriculum of Hogwarts or most European schools. While not better than their European variants, they often require different counter-spells or techniques than those your peers are familiar with.
Knowing a different school of magic would have been interesting.
[] Prophetic
Divination takes you whether you will it or not. You are expected to undergo one major vision a year and have the potential for smaller visions. You gain Divination III. Your Affinity influences the visions that you receive through your divinity. Some other minor skills—including Astronomy and Ancient Runes—benefit from your innate mastery of divination.
Divination could be handy in certain situations.
[] Opposed Wand
You and your wand do not get along. Advances in wand relationship take longer and regressions take place more easily. Your wand is more likely to switch ownership to another individual if you are defeated in a duel or other challenge.
Again this could have been interesting and/or fun.
[] Quibbles
You bought in fully to Luna Lovegood and her family's peculiar view of the world. You truly believe in a variety of different magical creatures whose existence cannot or will not be confirmed. You are, at a minimum, viewed as odd; many would go as far as to call you insane. Your relationship with Percy and The Twins is significantly reduced
Luna is cool, no doubt about it.
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As for the current vote this is what I want:
[X] (House) Slytherin
[X] (Motivation) The ambition to prove that your family deserves to stand as tall as any other and that you personally can overcome whatever challenges put before you. Getting the chance to outshine those who have always looked down upon you in their own house doesn't hurt. Ravenclaw would be more comfortable -- it's an obvious fit for your proclivities-- but Slytherin would push you to be the best you can by simple necessity.
@Corvus Black, has even better reasoning, plus there is always the chance that cousin Mafalda will end up in Slytherin and she sounds like fun.