Harry Potter and the Inheritance Cycle are your fandoms, you said? Both have dragons, IIRC, so ...
*rummages though bag of holding*
*Pulls out a few Poké Balls*
Here, have any non-legendary Dragon-type Pokémon of your choice!

As my Newbie Gift to you, here's a Highly Volatile Cupcake. Don't shake it, and NEVER feed it between 3:56 AM and 7:12 PM. Oh, and it doesn't like people with hats. Enjoy!

Welcome and stuff!
You should read the Constitution. It's important. The Original Series and the Wiki are also recommended reads. That said:
-Sets up a table with tea, scones and jam-
Want a cuppa?

Wow, that's probably the most laconic introduction ever. Tell us a little more about you. How'd you find us? What spinoffs (if any) have you read? What fandoms are you in?

Since I don't know you well at all, your newbie gifts are a plate of peanut butter cookies, three blue pens, and this super cool Disney fanfic.

Hello, and welcome aBoard! Do you have a preferred pronoun? Do you have any major fandoms? Would you like a squawking llama with an urple bow around its neck and a penchant for fanbrats? Too bad! You own one now! Make sure to give him fanbrats only once a week or he'll get fat.

Oh, and have some SPaGhetti (it's like spaghetti except it has an emphasis on spelling, punctuation, and grammar)!

Welcome to the PPC!

Hello and welcome!

I give to you now a lined Infinite Notebook, complete with urple covers and wilver binding! Really, though, I highly advise against looking at it. It'll blind you, probably.

-Aila

Here is a half-empty can of silly string and a mysterious stone that emits a bright, strobe light in various hues. (Don't stare too long. :P)

Allow me to have the honor of asking you what fandoms you are involved in.