If I have toriprime and VIP and I use the features it has, etc bigger image, symbol at start of name, usertitle.
If my toriprime or VIP expires, do I still keep the things I have already put on? Etc keep height and width of existing image, keep symbol at start of the name, keep usertitle, keep signature pic.

The only thing you can keep as if you had the features it's the avatar only.
If you try to change the image however, it will go back to the default size once you choose another avatar after the subscription ended.

Usertitle, avatar, and signature will remain. However, you won't be able to change it in the way you used to with TP/VIP

I'm pretty sure the signature will turn into plain Bulletin Board Code once the subscription ends.
The usertitle will go back to default, it will not stay the same as when you had VIP.

Example: 
[SIGPIC][/SIGPIC]

The image wont be displayed, just plain tags.
User with expired subscription.

Wrong, unless only VIP expires and leave him with toriprime, then his avatar and usertitle will stay the same but his signature would be resized to fit into the 150 x 400 size constraint.

But if both TP and VIP are expired. Avatar will stay at VIP size (150x150) until it is changed to another image (which will turn it into 100x100 from then onwards).

The signature picture will just disappear but if your TP/VIP signature had text in 4 or 5 seperate lines that will stay. But if you try change the signature, you will be forced to use the default maxium of 2 lines and 200 characters of text (including links).

Usertitle will change back to the default track, like mine which says Elitist (these change depending on your post count).

Wait, the avatar size for vip is 150x150?
So how do you get a 150x200 avatar?

By having admins for friends, or by paying a admin to upload one like that for you.

So does the symbol at the start of the name disappear as well?

My bad, only avatar remains

Yes, it disappears

If only the VIP expires then everything but the Background and the Symbol will stay the same, once the Toriprime expires, you'll be left like me, same avatar size, [SIGPIC][/SIGPIC] bulletin link in my sig (your sig's text will remain the same) and your usertitle will change back to your default one according to your posts, unless you have a usertitle image or buy a blank usertitle from the usertitle shop