Donnie was born to proud parents Don and Cassandra with his twin brother, Marty. Donnie was raised with the support of his maternal family members, Mortimer and Alexander.
Donnie became good friends with Lilith and Angela Pleasant with the influence of Cassandra and Mary-Sue. He currently holds an A+ grade at school. Donnie has been described as the more outgoing of the Lothario twins, using his charisma at necessary moments, creating an increasing popularity in his successful social life. Donnie also plays the drums.
Donnie is seen to be a fan of football (soccer). He is always around some friends and is very popular. Despite his popularity, Donnie always puts his younger twin brother first before anyone else.
When Donnie found out about what Trevor had said about Bella had angered him. He was thankful Dustin had decked him and Richie was there to help Dustin. Donnie didn't want to inform his parents about the incident- Marty wasn't going to say anything, so why should he?
A month later, Donnie met one of Richie's friends- Amy Ellis. The two became closer friends at Angela and Lilith's 18th birthday party.
A few years later, the two got married and had children. One daughter, who was the eldest, known as Sam to all her friends, and Derek, who was silent.
Donnie was originally a scientist alongside Richie, but his friend's rapid promotion made him realised how mediocre hi job really was. He decided to keep going, but to keep his mind off of things, he became a part-time session drummer for the Shifting Paradymes (Jasmine Rai frequently got ill, and was often unable to turn up to studio sessions).