Monster Island

A zombie trilogy by David Wellington, originally available as online serials and now in print. Can still be read for free here.

Once upon a time, there was a United Nations weapons inspector named Dekalb who one day found himself imprisoned, along with his young daughter, Sarah, by a Somali warlord. In exchange for his daughter's safety, he agrees to go on a mission to New York City to retrieve AIDS medication for the ailing warlord, along with her soldiers... who also happen to be teenage girls. Oh, and the entire world has also been engulfed by a zombie plague of unknown origins, so there's that. Along the way, they meet Gary Fleck, (not quite) MD, a man who found a way to retain intelligence as a zombie, who tags along for... a while. Now it's simply a matter of getting to the UN building and not getting eaten.

Hordes of flesh eating monsters, an ineffectual government worker, a small army of child soldiers, and a zombie doctor: naturally, everything will work out just fine.

Consists of:
 * Monster Island
 * Monster Nation: A prequel, which deals with the source of the plague.
 * Monster Planet: A Time Skip sequel, focusing on Sarah and Ayaan's battle against the liches twelve years later.

This series provides examples of:

 * Bilingual Bonus: Make sure to have your Somali <-> English dictionary handy, because there might be some important things revealed...
 * Elite Zombie: The liches and their myriad of special abilities: telepathy, mind control, possession, mass fungal growth...
 * Emergency Transformation:
 * I Am What I Am: Initially, Gary tries to act like a normal human. However, his instincts eventually win over and, he begins to identify with the undead.
 * Life Energy: What the zombies are really after.
 * Night of the Living Mooks: "Normal" zombies compared to liches,
 * Our Zombies Are Different: In addition to the standard mindless zombies, we also get liches-- people who maintained supply of oxygen to their brains during their transformation, and also develop a grab bag of supernatural powers for some reason. Then there are the mummies, and the ghost zombies...
 * Stages of Monster Grief: Probably safe to assume that  went through this.
 * Warm Bloodbags Are Everywhere: Gary's stint as the team medic was... short lived.
 * What Measure Is a Non Human: "I have a right to exist!"
 * Zombie Apocalypse: No, for real.