For the inventory character selection, instead of adding ‘A, B, C, D, E, F’, why not just have left and right pointers that shift like if you were on avatar B then shifting left gets to avatar A and avatar C by going right.
That way you can just have an extra space, ‘Add new slot’ when the user has enough roses which will generate a new area for their new avatar and that would make it easier to add another 3 slots for people who already have 6.
And so it isn’t annoying that you have to keep shifting, maybe if you double tap an avatar from your profile really fast, it will take you into the inventory where you can edit the avatar you selected, like now where you just have to press ‘A, B, etc’
A final alternative option is to only show A B and C and allow the user to shift which ones are seen so he can edit D E and F instead if he wants to, and this will reduce clutter in the inventory section when more avatar slots are added.