There are 7 stages to xerography first commercially available by Xerox Corporation printer in 1960. I found this an amazing process especially in High Speed devices that put out a page per second or more.
During the xerography process the paper takes part in several of the phases.
Most laser printers use a combination of heat and pressure during the Fixing/Fusing Stage. This is where it bonds the previously electrostatically charged toner particles to the paper.
Paper qualities also have a play in this. All copy paper is not made equal.
I recall the design of a Xerox Laser printer (XP2400) that I had engineering responsibility for. It used no pressure roller but only a heat fusion oven to melt the toner onto the paper. When it worked properly the quality was a raised embossed shiny beautiful print. If there was a problem in this stage, the paper could get brittle and in some cases actually catch on fire (Fahrenheit 451). Early models actually had a small fire extinguisher attached.