Cassiopeia Lestrange

My Roleplaying Character is Cassiopeia Lestrange.Ring a bell? yeah I'm the only daughter of Bellatrix and Rodolphus Lestrange.You migfht think "Hey Cassie,why did you mention this here? this is mlp and not Harry Potter?" but the thing is I'm really good at crossing dimentions and going through portals just like Princess Twlight and my Bestest Bestie Forever,Sunset Shimmer.I have been to equestria a few times and also the human world and I also managed,as a witch to combine my own magical powers with equestria's magic of friendship.I learned a lot during my visits there and I really hope to visit again! And from all the Talented Bronies and Gentlemares I need to ask a bit of a favour:I'm the worst artist in the world and I would really like my own OC and my cutiemark,because the one I currently use is practically stolen from pinterest.so if anyone can help me...That would be a huge thing to me I could've asked Sunset but she's a bit busy with her magic lately....so really,if anyone can help for free...That would be great!! I hope my journey here is going to be a rollercoaster and I hope I meet a lot of friends on the way!! So cheers to bronies!!!

Can you please Tell me how to change blank flank princess? And I am your biggest fan