Harry appeared in a small train car, where he immediately froze.

An eleven year old blonde was crying quietly, huddled into a corner with her knees drawn to her chin.

It was obviously a Luna Lovegood, who was frightened and lonely from having few friends and just dealing with her mother's death.

"Hey." he said quietly, trying for comforting. "It'll be okay. You'll make a lot of friends in Hogwarts."

The girl raised her watery silver eyes to meet his, wide and innocent...

As she plunged a palm sized dagger into his neck.

Harry blinked. Blood gushed from his neck in an impressive spray, splattering the seats and windows red.

He idly wondered if red was actually the Express' natural seat color.

"That's very interesting." Harry decided, gently extracting the blade from his neck and casting a quick cleaning spell on the compartment.

"Here." he offered, handing the child her would-be murder weapon.

Her eyes watered again and she shrank into her seat. "I'm sorry..." she whispered.

He ruffled her hair affectionately. "No harm done. See?" he said, showing her his neck.

Incredulous, she ran her fingers over the unblemished skin as her other hand unconsciously took the offered knife back.

Her smile was as bright as he'd ever seen, and he idly wondered how she turned out as she had.

"You aren't hurt..." she murmured in amazement.

Her eyes focused and she glanced him over. "A Potter? A Harry Potter?" she noticed.

Harry shrugged with a nod.

She seemed to think deeply for a moment as her hand tried to stab the other side of his neck with the reclaimed blade.

Magic was helpful, in that the knife didn't pierce this time.

"What are you doing here?" she finally asks.

"I travel between dimensions to help people. You seemed to be wanting something that I can help you with when I appeared."

Her eyes were hopeful as she unsuccessfully stabbed at his neck a third time. "Really?!" she asked.

He nodded.

"Help me take over the world?" she asked.

Harry could only laugh.

~Line Break~

She was adorable, even as she was sorted into Slytherin just before she stabbed an ancient magical artifact with a small knife.

It was more magic than hat, so a simple repair spell had it fixed in no time.

He had stood corrected, when he declared there were no evil Lunas. Granted this one seemed more unconsciously evil rather than deliberately malevolent, he still found the situation interesting.

How did she become a little killer? Particularly using knives when there were basic spells that prevented stab wounds?

And how did she have such pure intentions to be able to summon him when her only request had been to help her take over the world?

He absently blocked another stab.

"I'm rather fond of those. Could you stab somewhere else?" he asked.

"Oh. Okay. Sorry." Luna agreed, apologizing.

For some reason, there was a rather large gap between them and the rest of the Slytherins. Also, no one was questioning his existence, despite the fact that most Hogwarts students were highly familiar with the upper years.

It wasn't like he changed his appearance, and black hair green eyes were the traits of Harry Potter alone.

It was rather peculiar, but maybe it was the way he unflinchingly let a knife scrape across the millimeter thick band of magic over his eye with an audible scratching noise.

A few of his answers were somewhat settled when he saw her grow dejected as several students scooted away from her.

"You like pudding, right?" he asked.

Her surprised expression had him scoop up a bowlful for her, and she set down the knife to pick up a spoon and dug into her dessert.

Absently, he cast a few quick enchantments on the knife to make it a bit more effective, and also unable to injure him or her. That way he could sleep without maintaining the charms subconsciously.

An interesting note is that, while goblin silver is a special material that makes superior gear, there were spells that gave regular weapons the same effect of absorbing things that would hurt it. It was mostly just that goblin silver with the same enchantment wouldn't need to absorb anything besides the most horrible substances, while an average steel knife would have to imbue itself with some goblin silver first.

The knife soon found itself skidding against his ribs once more as Luna finished her pudding.

"You're finished?" Harry asked. "I can show you to the common room for Slytherin."

She smiled and nodded, and they strolled out. It just so happened that they completely ignored Dumbledore, who had just stood to speak.