This tutorial isn't hard just time consuming. I don't really know if I like it necessarily, but it's pretty cool.

Apps needed:

-superimpose
-phonto

Open a black background in superimpose and open one the templates below. Size it to your screen and merge.

Templates:

Find the PNG you want as your main one, mine was Stiles, Allison, and Lydia. Place it at the top and hit the screen button.

You should be able to see the white lines on top of the PNG. Tap the mask button and the brush icon.

Erase any of the PNG that goes under the lines. Example below.

Example:

Once you've found where you want everything merge and find your next PNG. The pngs can be whatever you want I coordinated mine to the main one.

Add your next PNG and repeat the same steps as the first one. Tap screen and erase any thing that goes outside of the lines.

Keep repeating until you have as much space filled up as you want. Example below.

Example:

Save to camera roll and open in phonto.

Add your title and all your other stuff. Save to camera roll and your done.

This tutorial is kinda tricky and if you have any questions comment below.