Open Cheatengine

Change value type to text

insert MaFl_COMMONER03 in the blank text box

Hit First Scan

highlight all the Address that come out on the left side, click the red arrow

Highlight them all in the bottom box (Hold down CTRL & Click them all)

right click and go to change record>value

then u change it to MaFl_Bobochan or any npc you wish to use.
MaFl_Peach

Press OK/YES to all opening options.

Click Frozen on all Addresses on the bottom box.