I think Dave Mirra: Freestyle BMX 2 would make for an entertaining TAS, especially if it went for 100% completion. A few months ago, I started routing 100% but never got around to finishing it. I might TAS this game one day but it needs more work with routing. In my opinion, 100% completion would be to earn max respect (50,000 respect points) for any character. This means completing every challenge, earning gold medals in all the competitions, jumping every gap, and breaking all the records. There's nothing else to do in this game besides that.
Even though each character has their own stats, I find that they are largely irrelevant. The difference between the top speed for each character is so minuscule that it's not even noticeable. But the character with the highest starting speed stat is Todd Lyons with his standard bike. I believe he would be the best character for a speedrun or a TAS since he is tied for having the highest speed while also having average stats in everything else. His air stat is also pretty good. To see how much of a difference the speed stat really makes, I compared Todd Lyons with his standard bike to Dave Mirra with his standard bike. Todd Lyons has the highest speed stat and Dave Mirra has the lowest speed stat. Starting at the farthest edge in the Woodward Park map, I went in a straight line until I hit a wall near the other side of the map. The difference was only 0.2 seconds, so it's safe to say that the difference in stats isn't much, at least with the standard bikes. But Todd Lyons is a tiny bit faster so he would be my choice.
This game is riddled with out of bounds glitches and cool ways to clip through walls and doors. I don't fully understand how it works, but the collision in this game is pretty easy to get through. Here are some videos of me getting out of bounds. There doesn't seem to be any luck involved. It's all about doing a nosepick or wallride at the correct angle.
Woodward Camp OoB near the start:
https://youtu.be/CW9pgYCyygY
Woodward Camp, clip through garage doors:
https://youtu.be/3gujxlUGqio
Trainyards OoB near the start:
https://youtu.be/UWOAbVQOsUM
Swamp Trails OoB through a tree:
https://youtu.be/YOFkBdiVjoI
Greenville, NC OoB on the coffee shop:
https://youtu.be/S6JI96I2yUo
I've found several more places to clip out of bounds. I can replicate most of them. I'll update this list as I route the game more and find more clips.
The great thing about out of bounds glitches in this game is that any tricks you start while out of bounds will automatically complete when you respawn in the map. This means you can do crazy tricks and score hundreds of thousands of points in a matter of seconds. When you respawn, the game will always take you back inbounds directly above where you are at that moment. So you can clip in one place and respawn in a different spot if you carry momentum while going OoB. My Greenville, NC video linked above demonstrates this. I could see this being useful for climbing tall buildings quickly.
Fun Fact: The GameCube and Xbox versions of this game have 2 extra levels compared to the PS2 version. So there's a bit more entertainment to be had there.
Here is a google doc with my route progress. I haven't updated it in a while but I might get back to it soon:
https://docs.google.com/document/d/12TLepKh7s0qfsxbgvl9jL3McQRaCDJTKyLiz_koeJC4/edit?usp=sharing
