Finally finished the complete list and this took me forever. I practiced this on Lvl 7 CPUs in training mode so no rage accounted for and I'm not sure if CPUs use directional influence or not so can't say must for that. I actually only put the CPUs on "Attack"half way through until I stopped doing it to save time because I realized that it didn't really change my results and worked regardless if it was on "Stop" or "Attack". To help you understand the list, basically the reason why it says both sides is because for some character such as Mario, if Lucas is on the left side of the character (thus facing right) then it would work say 2% higher then compared if he was on the right side of the character (facing left). For the ledges, you have to stand all the way on the end of the ledge and for some reason that greatly affects as to what percents this combo can keep working. It could be useless and it could be really useful, I'm not sure but I thought it'd be something I would just add in for fun anyways. I didn't test this with customs so I'm not sure how it'd work for Hyper Monado Arts Shulk or different weight Mii Fighters. I just used Default Mii Fighters (their size when you make them in the Mii Maker) because most often only Default Mii Fighters are enabled in a non-custom environment. You guys are free to test it out on different size Miis or Hyper Monado Arts to add onto the list but I'm to lazy to do it as this list took forever.
Working Percents: Down Throw -> Up Tilt
Mario: 26% (facing right), 24% (facing left). (97% on left ledge, 96% on right ledge)
Luigi: 14% (facing right), 13% (facing left). (97% on left ledge, 96% on right ledge)
Peach: 86% both sides (126% on ledges)
Bowser: 85% facing right, 87% facing left. (Ledge doesn't affect it)
Yoshi: 78% both sides (116% on ledges)
Rosalina: 52% both sides (111% on ledges)
Bowser Jr: Doesn't work at any percent (112% on ledges)
Wario: 45% on both sides (71% on ledges)
Donkey Kong: 62% both sides (139% on ledges)
Diddy Kong: 62% both sides (Ledge doesn't affect it)
Game & Watch: 51% both sides (81% on ledges)
Little Mac: 64% both sides (122% on sides)
Link: 68% both sides (135% on ledges)
Zelda: 78% both sides (115% on ledges)
Sheik: 63% both sides (131% on ledges and kills)
Ganondorf: 3% both sides (25% on ledges)
Toon Link: 66% both sides (98% on ledges)
Samus: 131% both sides (174% on ledges and kills)
Zero Suit Samus: 22% both sides (Ledge doesn't affect it)
Pit: 74% both sides (136% on ledges)
Palutena: 73% both sides (116% on ledges)
Marth: 99% both sides (144% on ledges and kills)
Ike: 49% both sides (146% on ledges)
Robin: 108% both sides (155% on ledges)
Duck Hunt Duo: 54% (facing right), 55% (facing left). (90% on ledges)
Kirby: 32% (facing right), 33% (facing left). (Ledges doesn't affect it)
King Dedede: 66% both sides (170% on ledges and kills)
Metaknight: 73% both sides (106% on ledges)
Fox: 55% both sides (107% on ledges)
Falco: 67% both sides (99% on ledges)
Pikachu: 65% both sides (84% on ledges)
Charizard: 103% both sides (Ledges doesn't affect it)
Lucario: 41% both sides (92% on ledges)
Jigglypuff: 35% both sides (Ledges doesn't affect it)
Greninja: 81% (facing right), 80% (facing left). (142% left ledge, 143% right ledge and kills)
R.O.B.: 101% both sides (Ledges doesn't affect it)
Ness: 51% both sides (89% on ledges)
Captain Falcon: 71% both sides (146% on ledges)
Villager: 76% both sides (118% on ledges)
Olimar: 62% both sides (Ledges doesn't affect it)
Wii Fit Trainer: 83% both sides (134% on ledges)
Shulk: 55% both sides (140% on ledges)
Jump Monado Shulk: 106% both sides (181% on ledges)
Shield Monado Shulk: 117% both sides (194% on ledges)
Smash Monado Shulk: 26% both sides (104% on ledges)
Dr.Mario: 26% (facing right), 24% (facing left). (97% left ledge, 96% right ledge)
Dark Pit: 74% both sides (136% on ledges)
Lucina: 98% both sides (142% on ledges)
Pac-Man: 49% (facing right), 50% (facing left). (79% on ledges)
Mega Man: 70% (facing right), 68% (facing left). (118% on ledges)
Sonic: 30% both sides (Ledges doesn't affect anything)
Mewtwo: 51% both sides (88% on ledges)
Lucas: 51% both sides (89% on ledges)
Roy: 102% both sides (148% on ledges)
Ryu: 62% (facing right), 59% (facing left). (144% on ledges)
Default Mii Fighters: 49% both sides (99% on ledges)