I would say Geddy leans toward introvert but they were all very humble. The first real conversation I had with Geddy, we talked riding both bicycles and motorbikes and music. He said at that time that he was just happy to be a working musician. Peart was a solo act. He liked his reading time and cycling solo. All 3 enjoyed performing though. Geddy and Alex were school chums whereas Neil came along later. I think he felt literally the third man in, even though he was so integral to the sound. Deep down, he was probably right.
Watch this version of Xanadu. I believe it is one of their best composures with time signatures all over and the early synth stage of the band. Both Geddy and Alex have double necks so Geddy played Bass, synth organ, guitar. Alex played 6 and 12 string with a huge array of pedals. Neil had relatively few electronic sounds and was all over playing the bells etc. Xanadu though, is based on a poem by Samuel Coleridge. Not the lyrics of a pop rock band, for sure.