The Tag Fairy rarely responds to begging. She's like a good parent in that way. Behave yourself and "We'll see," beg or whine and you get nothing.
She hangs out on some boards more than others and doesn't spend much time here on TPAS. But she visits here sometimes.
TF puts colored words under your name. They're usually stupid things you said about yourself. If you posted this long story in which you saved the planet and rescued a virgin from a fate worse than death, but at one point said, "I'm a bobo when it comes to aeronautical engineering" - you would find the words, "I'm a bobo" under your name. Say one dumb thing about yourself one time and that's the day she'll be flying around the boards.
On occasion, she'll give one person another person's tag, but those are few and far between. She's also been known to put things in people's signatures - personal responses, fairy dust, Chachis - whatever she feels like. She's the TF and does things as the spirit moves her.
TF is NOT fat and likes rock music. She loves chocolate, but don't try to bribe her. I think the TF might be getting old (or at least thinks she is getting old), but am not sure.
If she gets pissed off, she puts you on the naughty mat. So, don't piss her off.