As the series is over, here what may be a finalization of my choices.
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Taiki: Logan Grove (Gumball)
-Shoutmon: Quinton Flynn (Lea, KH series)
--OmegaShoutmon & DigiXros forms: Quinton Flynn (Axel, KH series)
Kiriha: Aaron Spann (Onion Knight, Dissidia)
-Greymon: Lex Lang (WarGreymon)
Nene: Madeleine Hall (Wilykit, Thundercats)
-Sparrowmon: Megan Hollingshed (Emilou Apacci, Bleach)
Akari: Mae Whitman (Yuffie, KH2)
Zenjiro: Bryce Papenbrook (Zidane, Dissidia)
Yuu: Brittney Karbowski (Selim/Pride, Fullmetal Alchemist Brotherhood)
-Damemon: Tom Kenny (Spongebob Squarepants)
--Tuwarmon: Tom Kenny (Rin, FFX)
Ballistamon: Dee Bradley Baker (Claus, American Dad)
Dorulumon: Steven Jay Blum (Zabuza, Naruto)
Starmon: Richard Epcar (Bobobo)
Beelzemon: Derek Steven Prince (Tamers version)
Cutemon: Brina Palencia (Nina Tucker, FMA)
Kamemon: Jeff Nimoy (Motimon, Digimon Adventure)
Donokomon: Michael Sorich (Neemon, Digimon Frontier)
Dracomon: Mona Marshall (Terriermon, Digimon Tamers)
Monitamons: various
Pickmons: various
PawnChessmons: various
Jijimon: Michael Sorich (Hippopotamus, Blue Dragon)
Beelzemon: Derek Steven Prince (Tamers version)
Knightmon: Liam O'Brian (Kain, Dissidia 012)
Persiamon: Tara Strong (Twillight Sparkle, MYP:FiM)
Wisemon: Dave Mallow (Angemon, Digimon Adventure/02)
Mevramon: Erin Fitzgerald (Mila Rose, Bleach)
Deckerdramon: Peter St. Paul (Xemnas, KH series)
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Bagramon/Darkness Bagramon: Michael McConnohie (Barragan, Bleach)
DarkKnightmon: Jamison Price (Lordgenome, Gurren Lagann)
Tactimon: Tony Oliver (Ggio Vega, Bleach)
Lilithmon: Karen Strassman (Cyan Sung-Sun, Bleach)
Blastmon: Patrick Seitz (Sloth, FMA Brotherhood)
Dorbickmon: Christopher Sabat (Garland, Dissidia)
NeoMyotismon: Richard Epcar (Myotismon)
Zamielmon: Joe Ochman (Makuramon, Digimon Tamers)
Splashmon: Brian Beacock (Sakon, Naruto)
Olegmon: Michael Sorich (Nirgge Parduoc, Bleach)
Gravimon: David Kaye (Seeshomaru, Inuyasha)
Apollomon: David Lodge (Jiraiya, Naruto)