I have no skin in this game

d8s with duplicate sides gang
- Flipping a coin two times and reading the result as binary gang. (Don't actually do this, coins aren't as fair)
  
  They're only off by about 1% and the bias depends on which side was up, it's not that bad. I wouldn't expect most inexpensive dice to be substantially fairer than that.
- D12 with numbers in triplicate appreciators over here
  
  D100 with 25 of each option lover right here
- Honestly I'm sure this is the best solution. I get that a d4 is the obvious choice for something that should have a 1/4 chance of happening but a d8 with 4 numbers twice would be the most appropriate.
  The only downside I can see is that a d8 and a d8/4 would be easy to mix up at first glance.
  
  You don't even need a special die for this. Just roll a d8 and subtract 4 if it's 5-8. Just like using a d6 as a d3.
  
  Honestly you only need a d20 and a d6. D4? Divide by 5. D8? D20/5 x d20/10. D12? D6xd10/2
  MATH BABY
  
  I have a "D3" that's just a D6 with two of each.
  
  You already have d10 and d100 (d00? What do we call the other one?), so there’s precedent for duplicating shapes.
- I’d actually like to see a d8/d4 hybrid. Basically take a caltrop d4, snip a bit off the ends to make a truncated tetrahedron. You’ll then have 4 large hexagonal faces and 4 small triangular ones. Put the numbers on the triangles. If it lands upside down, then it is just house rules whether to use the bottom face or to reroll. Or just number the large faces too.
  It’s a similar concept to the round safety d4s; just less… round.
  
  Like this?
  https://www.kickstarter.com/projects/263612668/rollable-4-sided-dice
  They're out there somewhere...
  
  Wilder option which is definitely hard to mass produce:
  A truncated tetrahedron like this but with wireframe corners, so it rolls like a D4 but there is a clear upward face.
- Altered Magic 8-ball Syndicate.

Just use a dreidel, ya dingus.
For your health.
- I've never actually had to roll a d4 on a table. Baldur's Gate handles it for me.
- This is the way

I don't get what this means, roll on top or bottom of what?
- There are 2 kinds of D4 dice. The result can be on the bottom or on the top of the "piramid".
  
  ...well, there are more than two kinds of d4s, but there are two popularly-styled tetrahedral d4s...

GURPS for the win, bell curves are the way to go.
- FATE will still get ya!

Arch d4 gang