So as a kit we do see that she is easily ignored and yet though everyone likes her she isn't important, not mentioned by Ranboo herself that much. So I think that she does get posed by ShiningStream and after that in not too sure how she gets the scar I think she actually fights moonpaw or saffronpaw(yes I do think she will get a scar one of her eyes) and i'm not too sure after that. I think that ShiningStream possesses Tansypaw because he needs someone to do his work who is alive.So the way I think is that he convinces Tansypaw that everyone hates her And the reason Tansypaw agrees is that moonpaw is avoiding her,perfectpaw hates her and her parents are too wrapped up with perfectpaw.(Not to mention that nightfang is not that good of a father.) Now here's how moonpaw's dreams fall into place we see that moonpaw is water and tansypaw is fire. we see that moonpaw puts out Tansypaw. Moonpaw interprets that she will kill tansypaw but I think it is to actually help tansypaw not be posseted but moonpaw avoids tansypaw leading to ShiningStream to posses her. I also think moonpaw confirms that ShiningStream posses tansypaw because in toph song 7 the song Why, it looks like moonpaw is angry at ShiningStream believing that the cat in her eyes is ShiningStream. Also this is all goldenfur's fault. first off I do think she killed ShiningStream. So then ShiningStream never got too see his kits grow up.(also ShiningStream totally knows he was murdered and that goldenfur lied.) ShiningStream's only goal is to make goldenfur pay the price and some how laurewing knows this or is involved so ShiningStream has to get ride of her. (Also perfectpaw is halfway wrong about frostface being evil because frostface isn't evil but his dad is.)
9rainbowtails made the characters....\ um really hope i'm right.