I have checked the history on the UR wiki and its the bio you just mentioned It doesn't seem to of changed (might be wrong and the history on the wiki dosn't show the old artical just the changes but I think its correct).
Though it has happened befor with Magenta. You can find what it used to say in the trivia section here: http://urban-rivals.wikia.com/wiki/Magenta
Well,if you're talking about over the course fo the game,i dont know it to happen.I know of levels and stats to be changed,but if you want in general,there is the infamous Jayzel incident where Jayzel was oringally supposed to be a crossdresser,but people figured it would be too offensive so they made here the Jayzel you see now.
I remember some recent description changes for Ellie and Tsuka, who shipped out with the wrong ability descriptions. Tsuka's card said she was a DR(-3 min 2 iirc) but she actually had the -life ability all along and Ellie had courage added to her ability. I don't know if that was a last minute change or if she was Courage all along. Judging by the comments on Ellies page you would think it's the former but then again. Roots players tend to be a bit... dramatic.
I think there also was a third card in the same release as Ellie and Tsuka who also got a change later on (yeah UR did a splendid job there) but I completely forgot who it was.
And a little bit of digging later: it was Milena who was in the same release as Ellie, Tsuka and Fanny. Milly was changed from rare to uncommon. Tsuka was indeed a DR(-3 min. 3) but didn't actually DR as she shipped with a -life mission. Ellie probably did actually ship out without courage at first, which possibly makes this a rare case of UR changing a card after release. Wish they would've done that to Mokra
Milena's bit was not a description change, but I'll note it anyway to be complete.
URDB gets all character info and bios as soon as characters are released, and unless I change them manually later the info isn't updated (this is done to prevent errors with different translations).
So if the bio is the same in urban-rivals.com and urdb.kirlad.net then the almost certainly it wasn't changed.
So Redra didn't change then like I fought.
This still leaves Magenta as the only card, i think, Who has had a bio changed which wasn't due to the bio being bugged or incorrect.
"When she was first released her bio included " Magenta is certainly Clint City’s most attractive resuscitated corpse. But she is also its most dangerous and, dead or alive, she certainly doesn't consider herself a sex object!" But it was changed to "Magenta is certainly Clint City's most attractive resuscitated corpse. But she is also its most dangerous and, dead or alive, she is nobody's slave!" Also, in most other languages, the bio isn't adapted to the new translation (they stil use the "sex object" part)"