(The margled text is in rot13 and gives much larger hints. You can look up a decoder if you need it.)
Cassie: Get involved with the Don. (Va gur fyhzf, ershfr gb cnl gur gbyy thl. Arkg gvzr lbh pbzr guebhtu gur fyhzf, na rirag jvyy unccra; ershfr gb cnl va gung rirag gbb.)
Rinny: Win battles in Transylvania and read the dialogue. (Gurer vf n uvqqra ragenapr arne gur gbc yrsg bs gur nern. Whfg gel jnyxvat ba rirel gvyr gbhpuvat gur yrsg jnyy hagvy lbh svaq vg.)
Boobs: You'll unlock body modification options over time with story progress.