ummm..... well try the whole roster first before choosing a sub main.I don't have a sub main at all.I main Carl and Carl only mainly because I love shotas..-. it didn't take me that long to learn his style.trying out the whole roster made me somewhat decent but not good with all the characters.ragna,jin,and noel are good starters since they have a solid learning curve so try them first then move on to another character until you found someone you think suits your playstyle.if you keep losing,don't you worry keep practicing,it doesn't make you perfect but it makes you better.