Bevendre

When Papi converts someone they assume a base form of a typical changeling drone, so only one horn.  If the drone maintains that form completely, or changes it to suit their own tastes, then they may.

Where to start?

Skylark is such an amazing guy.  He works so hard with Scoots and is an incredible storyteller.  His art is adorable, and unique though he may say otherwise.  He’s a wonderful animator, and an all around great guy.  I’d love to actually meet him because he’s such a relaxed person, and I owe him a lot.
Scootaloo the Adventurer is a wonderful blog filled with cute characters and great storylines.  I love the backgrounds and atmosphere in the blog, and it’s often mindblowing how quickly Skyly can put out updates when he’s on a roll.

Wiggles is Wiggles and needs no introduction.  She’s funny and kind, always appreciative of fan art and supportive of her followers.  She’s an all in all great person, and the only one I can think of that could pull off mystery pone as long as she did with so many followers.
AKS has rapidly become one of my favorite blogs, and I’ve followed it since near the beginning.  The growth and development of the characters is very impressive, and the humor is always well planned and balanced with the drama.

Spectral is a cool guy, who I wish was on DoS more because he’s always great to talk to.  His art style is amazing and his spectralizations are an art form unto themselves.
I do miss his Ask-Spectral blog, and want to see the origins of his OC more.

Spike is such a cool guy, and obscenely talented though he doesn’t admit it.  Whenever he’s around he’s the first to offer help and support, and though he can be just as goofy as anyone else, when it’s needed he’s an excellent voice of reason and compassion.  He’s too self-critical for his own good at times, but I long for the day that I can do in 4 hours what I’ve seen him accomplish in 40 minutes.

Shady is crazy.  End of story.  She’s a fun kind of crazy though, the kind that can take something insane and make it work marvelously.  I can’t think of another person who could become so enthralled in their own crackship to come up with so many blogs and tackle them in so many different ways.
I can’t choose just one of Shady’s gazillion blogs, but I’ll just say that while Sombrashy is a crazy ship that should never have happened, Shady has managed to not only maintain it, but make it believable.

If there’s any one person I’d like to meet, it’d be Ruuqo.  She’s batshit crazy, in an endearing way.  She’s such a cool person and one of the best friends I’ve made on tumblr.  There’s not much more that I can really say about her tha others haven’t said better time and again.
I love Twilonequus, it’s such a cool idea.  Even after the reboot Ruuqo’s shown some great ideas in it, and I can’t wait to see the return of Grogar and the Smooze. 

The change does not affect memory in the drones, nor did it change Papi’s memory.  She still remembers who and what she was before becoming a queen, and may use such knowledge should the need arise.

Sadly no, Papi still speaks proper Equestrian.
Changelings don’t communicate through chirps, clicks and trills, though the noises are common among changeling nymphs. 

Changeling Warriors are bred to be large, strong and armored for a reason.  They are not above sneaking behind enemy lines for an assault, but they prefer strong, direct attacks over guerrilla tactics favored by the drones and workers.  Think of the warriors more like shock troopers than ninja.

Fleur fears that because she is half unicorn and half Saddle-Arabian, and such a mix is rare if not unique to her, that she is a hybrid, and as sterile as a mule.  She fears hearing the truth so she has not gone to seek a medical opinion on the matter.