"good character transformation" haha @ what lies at the end ;)
i'd recommend moritat too!! one of the few bl mangas i've read with a pretty convoluted plot.
"transformation" - If you mean Shape-shifter..
http://www.mangago.me/home/mangalist/1491/
http://www.mangago.me/home/mangalist/94548/
I'm looking for good Yaoi/shonem ai mangas with a good plot and good character transformation.