It's useless to try to change peoples' minds about Vivianna or Yaqi or the TIB or any other BS tickling clip... no matter if you use your tickle_fetish, CDFGA, 1golfer, denise21, or whatever other name you've created on here. Find a different career because you're a bad dictator and you're just odd for using a female name on here!!
There's no doubt in my mind that Vivianna acts ticklish (a ticklish foot will respond with toes curling down and the foot bending and twisting to avoid what's tickling it), but the people who tickled her might just suck at tickling... so I wouldn't say she's not ticklish. She role played as a nurse in a TC clip a while back and the tickling she got there seemed real. I've seen lots of Vivianna's work and TC 5489 may be the most candid.
I'd so tickle Vivianna the way she needs to be tickled, but she'll have to wine and dine me first because I'm not that easy and my fingers are in demand. She'd have to have a good sense of humor too; otherwise, it would never work out. A sense of humor really makes or breaks the tickling!!