I don't own MKX or RWBY. Also, I don't know much about RWBY; I only know about teams RWBY and JPNR and Cardin and Velvet and their weapons and semblances and enemies. Also this is my first real story, so no bad reviews please. Btw, Shao Khan is in this series too. Shao Khan also showed Scorpion(you) that Quan-chi destroyed your clan not Sub-zero. Shao Khan also showed a memory of you and Sub-zero being twins but were separated by Quan chi whenever you 2 were 2 months old. Shao Khan died showing you those memories and he taught y'all a new fusion technique which lasts until you say defuse while your fused. Also, you go by the name Scorpion in the series, only 3 people call you Y/N: Ruby Rose, Sub-zero( he also calls you bro), and Quan chi. Btw, yes, you and Sub-zero will be on the same team. Also, Quan chi will work together with Cinder and Salem for world domination. Btw, for you and Sub-zero to fuse into Sub-Corpion, the 2 of will have to be facing the same direction, stand arm lengths apart, then cross your chest with the arm closest to each other with your index and middle fingers sticking out of that hand, then you will say "fire" at the same time Sub-zero says "ice", then y'all will extend those arms toward the bottom middle, then once the fingers touch, both of you will say combine at the same time.  That is how you and Sub-zero fuse into Sub-Corpion. Also, it costs no energy to power up or fuse. Also in your 2nd Sub-Corpion form, you have limitless energy.