Step 1: install
you can replace the model with any ped on game, all you have to do is rename hollow.txd and .dff to a chosen ped, for example, hollow.txd rename to fam1.txd and hollow.dff to fam1.dff (fam1 is one of the grove street gang member)

Step2 How to play as Hollow Ichigo
After you did step 1 above, I used "SanAnStudios3" to chose any ped and use it as CJ