There's about 3 people in my office who are there every single day regardless of our work-from-home days.
One is the funniest/chill guy in the office, but he literally lives a 5 minute walk away from the office so in his case I'd probably be there too.
Another is a fairly newly hired developer, nothing odd about him but seems to think he has a hand in decision making after 3 weeks, which doesn't always go over well.
The third is a bit of an enigma to me. Easily the most highly skilled developer in the office. Chill guy, married with kids, doesn't say much but when he does it's often to joke around with others. Very helpful to new employees too etc. Here's the enigma part though. Ever since I started working there around 1.5 years ago, I've never seen this man either come in the office after me, or leave the office before me.
One time I worked 3 hours overtime because I was meeting up with friends nearby after work around 8 PM, and that's the only time I've seen him leaving the office. I know he has not only the most difficult and most integral workload but jesus, he literally works 9-10 hours a day.