Trixie: “If Trixie hadn’t teleported out of her wagon when it careened down that street out of control, it would have been heavier, therefore faster, and the crash would have been even worse!”  
Twilight: “And why haven’t you taken Starlight with you?”  
Trixie: “Because Trixie’s magic is specifically honed for a one-pony show and doesn’t allow the direct inclusion of a sidekick!”
 
Trixie: “Twilight, do you even know how hard it would have been to get the original ingredients for this potion? Trixie had to improvise and substitute a few of them.”
 
Trixie: “Can Trixie have your room in the castle while you’re here?”
 
Twilight: “You took a detour through these hazardous, disease-ridden swamps as a shortcut from Somnambula to Canterlot?”  
Trixie: “It also got us to the hospital more quickly, didn’t it?”
 
Trixie: “Of course Trixie tested this spell in a controlled environment, Twilight! If Starlight doesn’t have everything under control when it comes to magic, who does?”
 
Trixie: “Oh, and Starlight, you can thank Trixie later for continuing your diary while you were gone.”

@liquidsodanium  
Longstringofdigits would actually be a decent handle.

You sure you want to be called [long string of digits]?

“Trixie has nothing to do with it this time, Trixie swears!”