Update: they are now P3Ds! The original link has been replaced with the new files. Some characters have minor joint issues which hopefully shouldn't be a problem. "Maggie (Lisa naming)" is Maggie with Lisa's name internally e.g. "lisa_h_merged" so she can be inserted over Lisa just by renaming the file.

I really love these, especially Otto & Kearney. Such a good share!

I use the built-in model dumper that's present in older versions of PCSX2, in my case version 0.9.8. The models come out skewed but can be readjusted with Blender although you'll want the game in freecam mode with it at a distance to get the full object. I've also used it to get models of the levels but it'll be a huge effort to get them close to how they're supposed to look and with the textures assigned.

@BleedingGumsHibbert nice one! Hopefully more dialogue will emerge that can be used for him.

I've now created two models based on the hounds by modifying their Simpsons Skateboarding models and a Sherri / Terri model, who like with Mel, I created using hair and clothes from Skateboarding and combining with Hit & Run models.

For the hounds I only made them into obj files since I didn't know how I'd incorporate them into p3ds with them being four legged animals.

Unfortunately that seems to be it for Skateboarding characters that weren't also in Hit & Run, Road Rage or any already existing mods. Martin was in Skateboarding but of course he already has a custom SHAR model in Donut Mod. That said, in the prototype there are bears and might be more animals in the game files that are worth looking at.
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1drv.ms/u/s!AuWncdtY0pCUbF-UzBIbZ5RowkE?e=seoLTF

Look at this video. I used your model and added dialogue to him from "Who Shot Mr. Burns? (Part Two)". He only speaks when he's attacked by a pedestrian, not a vehicle. Don't worry, I put credits to you on the YouTube video description.

www.youtube.com/watch?v=g_6B2jrCt8s&feature=youtu.be&ab_channel=VinceHutter

Looks really nice for a first attempt at a completely custom model! I always enjoyed how odd Mel’s design is with the blue hair and bone in the middle. You did a great job on the head.

Thanks for sharing!