You can change your writing by simply adding (*) before and after the message to make it bold, add (-) to make it italic and (~) for strike.
To make your friends profile picture as monkey you have to rename the monkey image as your friends number without (+), then paste the image on your friends profile picture.
If you want to read your friends messages without blue ticks so you can easily trick him by going to airplane mode. After going to airplane mode read the message and close the application. Now your friend will not know that you have read his message unless you open whatsApp again.