Neither do any thing that violate the Circle rules, Vivieann most of all, remember shed be first enchanter if she could, the circle dosen't say you cant have postions else where, you just have to prove your not a risk before you get those postions
Um...last try, before this turns into a repetitive back and forth.
1. Wynne is possessed by a spirit for the entire time we know her.
2. The player characters shouldn't count. Too many variations. But, in many cases, the player character helps Jowan to steal his phylactory from the Ferelden Circle Tower, so there's at least one rule broken, & who knows how many other examples we don't witness as part of the game. Plus, it seems to me that if the mage HoF's entire adulthood is spent apart from the Circle, that's pretty telling.
3. Vivienne is the most complicated example because she does, indeed, obey the letter of the law... but not the spirit. She insists that mages shouldn't be free, but she works hard to make sure that she, herself, is free to do as she pleases.
I suppose that the counter-argument there is that, "Well, if Vivienne can negotiate an acceptable measure of freedom as a Circle mage, maybe any Circle mage could do the same..." -- but I don't think that's true. Vivienne succeeds because she is utterly ruthless. She sets her sights on a goal & she tramples anything in her way.
In any case, no matter how you look at it, Vivienne's lifestyle is very different from the average Circle mage's. The fundamental rule for most Circle mages is that they remain isolated from the general public--Vivienne lives in a populated urban area. Mages are discouraged from marrying or having children--but Vivienne sets herself up as mistress to a duke, so she gets some version of the lasting, public (she's integrated w/ the duke's family) romantic relationship denied to most of her kind.
It's also worth noting that Vivienne is presented as a gifted mage who, nonetheless, takes a job--Court Enchanter--which doesn't use any of her skills. I think at one point she explains that Court Enchanter usually just light lanterns & do parlor tricks? Why would she make that kind of trade? It's not because she finds life in a Tower so fulfilling.