Yep.
Rosalina ''liking'' or ''favoring'' Big vehicles is a plain and individual Headcanon.
In MKWii , Rosalina would obviously use large vehicles . Well duh , she is restricted to use them since that's how the game arranged them. They are exclusive to the large class.
In MK7 , Rosalina can be seen using any type of vehicle , Like anybody else , you can see Peach with Monster tires etc... , like many other characters but as stated above , she would occasionally favor the Birthday girl. However this is just steretypicaly arranged , as the Birthday girl kart is only used by Female CPU (Honey , Rosalina , Peach and Daisy) while the males never use it unless it's the player.
In MK8 Rosalina still uses normal combinations along with some others like the ATV in her promotionals. But the thing is , that all the other CPU can use it too , i believe Rosalina (and many others) don't have an ''unique'' CPU combo.
For Example Peach is the only female CPU (IIRC , i think PGP can too) That can use the Badwagon . Rosalina doesn't , and Daisy doesn't pick it either. Meanwhile , CPU Rosalina is seen in the Circuit Special , the Standard kart , the Retro Standard Kart , The normal Bike.
All three standard Vehicles above can be used by any CPU.
PGP , Peach and many others can use the CS.
The ATV is not exclusive to Heavy CPU , and if it was then it wouldn't have anything to do with Rosalina , it would have to do with the fact that the Heavy people prefer it , and thus Rosalina being in a Heavy class would be forced to used it.
