Well I finally got that grab range data up.
The Jigglypuff boards method didnt work for me cause it was too difficult to compare character grab ranges to make this list. So heres my method;
1. I created a custom stage with a horizontal platform made of blocks and then a wall on the left-hand side made of blocks. If you look closely at the horizontal blocks, you can see that along the top, there are little marks. I realized they were perfect for making measurements (It looks almost like a ruler

)
2. I used Mario as a control. I would roll left against the wall so that he was fas ar left as possible. This was also to make sure that Mario always started at the same spot.
3. I then proceeded to measure the furthest distance a character could be before he could no longer reach Mario with a STANDING grab. I started measuring from the characters ARM except for characters like ROB who would skew the data cause of how far their arms are from their body. In those cases, I used the point on their body closest to Mario as the starting point of the measurement.
I know there are a couple things that could change this data such as taller characters grab range being shorter than they should but because of how small these changes would be, I realized they wouldnt change the order that much if any at all and didnt worry too much about these small discrepancies.
Here are the results;
Tether Grabs (Grabs disjointed from the character)
1.Olimars Blue Pikmin
2.Olimars White Pikmin
3.ZSS
Olimars Red Pikmin
5.Olimars Yellow Pikmin
6.Samus
7.Link
8. Olimars Purple Pikmin
8. Lucas
9. Toon Link
10. Yoshi
11. Ivysaur
Non-tether grabs
*Note: None of these characters grabs were longer than the tether-grabbers although DDD came very close to surpassing Ivysaur.
12. DDD
13.Charzard
14. Zelda
15. Donkey Kong
16. Squirtle
17. Marth
Diddy
Snake
20. Kirby
ROB
22. Peach
Fox
Falco
Ness
26. Wario
27.Bowser
Pit
MK
Jigglypuff
Ike
Sonic
33. Pika
Sheik
35. Lucario
36.Wolf
ICs
Mario
Luigi
G&W
41. Captain Falcon
42. Ganon lol Near the bottom once again
Morpehus, If you want, Ill add the numbers I got. I just didnt think it was necesary but its really up to you.