This is just who I'd pick to from the sonic universe to correspond with DB characters, enjoy and comment:
Goku: Sonic the Hedgehog/Manic the Hedgehog (option, sonic is obvious but Manic is more fitting IMO)
Gohan: Manik Acorn
Piccolo: Knuckles the Echidna
Krillin: Miles "Tails" Prower
Bulma: Rogue the Bat
Yamcha: Rotor Walrus/Antione D'Coolette
Tien: Espio the Chameleon
Chiaotzu: Charmy Bee
Lauch: Cream the Rabbit/Bunnie Rabbot (Cream from Good, Bunnie for Bad)
Chi Chi: Amy Rose
Raditz: Manic the Hedgehog/Sonic the Hedgehog (same as with goku, these two are brothers but there roles make the brother opposite to them in DBZ more fitting, also cause sonic is older)
Vegeta: Shadow the Hedgehog
Nappa: Mighty the Armadillo
Saibamen: Coconuts
Frieza: Metal Sonic
Recoome: Storm the Albatross
Burter: Jet the Hawk
Jeice: Predator Hawk
Guldo: Flying Frog
Captain Ginyu: A.D.A.M.
Trunks: Silver the Hedgehog
Android 17: Fang the Sniper
Android 18: Blaze the Cat
Dr. Gero: Dr. Eggman
Android 19: E-100 Zero
Android 16: E-123 Omega
Cell: Mephiles the Dark
Buu: Chaos
Turles: Scourge the Hedgehog
Broly: Nazo
Bardock: Jules the Hedgehog
Grandpa Gohan: Chuck the Hedgehog
Mr. Satan: King Acorn
Videl: Sally Acorn
Pan: Sonia Acorn
Marron: Melody Prower
Goten: Ray the Flying Squirrel (probationary)
Bulla: Wave the Swallow
Yajirobe: Bark the Polar Bear
Ox King: Big the Cat
Kami: Athair
Guru: Pachacamac
King Piccolo: Locke
Dende: Tikal
Nail: Anti Knuckles
King Kai: Merlin Prower
Shenron: Erazor Djinn
Porunga: Alf-Layla-wa-Layla
Grand Kai: Vector the Crocodile
Korin: Omochao
More to come...