Dragon Ball Z: Budokai Tenkaichi 2 Cheats

Evil Buu: Evil Human Cannonball + Majin Buu
Final Form Cooler: Super Transformation + Cooler
Frieza: Beat him in story mode
Frieza 2nd Form: Defeat Frieza 2nd Form w/Vegeta, Krillin & Kid Gohan (Frieza Saga)
Frieza 3rd Form: Defeat Frieza 3rd Form w/Piccolo, Krillin & Kid Gohan (Frieza Saga)
Frieza Final Form: Defeat Frieza Final Form w/Goku (Frieza Saga)
Full Power Bojak: Ultimate Transformation + Bojack
Garlick Jr.: Demonic Star + Dead Zone
General Tao: Bros. of Crane Hermit + Memorial campaign
Giant Lord Slug: Slug + Giant Form
Ginyu: Defeat Goku(Ginyu) & Jeice w/Vegeta, Krillin & Kid Gohan (Frieza Saga)
Gohan Super Buu: Gohan Absorbed + Evil Buu
Gotenks: Defeat Buu(Pure Evil) w/Majin Buu & Hercule(Buu Saga)
Gotenks Super Buu: Gotenks Absorbed + Evil Buu
Grandpa Gohan: Master Roshi's pupil + Fox mask
Great Ape: Defeat Vegeta w/Goku(Destined Rivals Saga)(last Match)
Great Ape Baby: Super Baby 2 + Artificial Blutz Wave
Great Ape Bardock: Power Ball + Bardock
Great Ape Nappa: Power Ball + Nappa
Great Ape Raditz: Power Ball + Raditz
Great Ape Turles: Power Ball + Turles
Great Ape Vegeta: Power Ball + Vegeta (Scouter)
Great Saiyaman: Defeat Zangya & Bojack w/Teen Gohan(Bojack Unbound Saga)
Great Saiyaman 2(Saiyawoman): Defeat Broly w/Goten & Adult Gohan(Broly:2nd Coming)
Guldo: Defeat Guldo w/ Vegeta, Gohan, and Krillin(Frieza Saga)
Hercule: Defeat Perfect Cell w/ Super Trunks(Android Saga)
Hirudegarn: Hildegarn's top half + Hildegarn's lower half
Janemba: Saike demon + People's bad energy
Jeice: Defeat Goku(Ginyu) & Jeice w/Vegeta, Krillin & Kid Gohan (Frieza Saga)
Kibitoshin: Kibito + Supreme Kai
Kid Buu: Defeat Kid Buu w/Goku & Vegeta(Buu Saga)
Kid Goku: Beat Grandpa Gohan in the free event in the Destined Rivals Saga when you first take control of Goku.
Lord Slug: Namekian + Mutation
Majin Buu (Pure evil): Human gunman's gun + Majin Buu
Majin Vegeta: Defeat Majin Buu w/Supreme kai & Adult Gohan(Buu Saga)
Majuub: Defeat Super Baby 2 w/Pan & Ubb (Baby, The Avenger)
Master Roshi: Defeat Raditz with Goku
Master Roshi Full Power: Master Roshi + Seriousness
Mecha Frieza: Reconstructive Surgery + 100% Full Power Frieza
Metal Cooler: Big Gete Star + Cooler
Monster Zarbon: Broken Seal + Zarbon
Nappa: Beat him in Story
Omega Shenron: Syn Shenron + Ultimate Dragon Ball
Pan: Defeat Hirudengarn w/Tapion & Kid Trunks(2nd Time)(Wrath of The Dragon)
Perfect Cell: Cell saga
Pikkon: Beat him in Dragon Adventure
Recoome: Defeat Recoome w/ Goku & Vegeta (Frieza Saga)
Salza: Coolers soldier + Armored Cavalry
Sauzer: Armored Troopers + Cooler's Henchmen
SSJ 2 Goku: Defeat Majin Vegeta
SSJ 3 Goku: Defeat Fat Buu
SSJ Adult Gohan: History of trunks
SSJ Goku: Defeat Freeza as SSJ Goku
SSJ trunks (with sword): History of trunks
Super Android #17: HFIL fighter #17 + Android 17
Super Baby 1: Baby Vegeta + Lower class Saiyan
Super Baby 2: Super Baby 1 + Power from lower class
Super Buu: Defeat Super Buu w/ Ultimate Gohan(Buu Saga)
Super Buu Gohan absorbed: Absorb Gohan + Super Buu
Super Buu Gotenks absorbed: Absorb Gotenks + Super Buu
Super Garlick Jr.: Giant Form + Garlick Jr.
Super Gogeta: Defeat Janemba(Final Form) w/Pikkon(Fusion Reborn)
Super Gotenks: Defeat Buu(Pure Evil) w/Majin Buu & Hercule(Buu Saga)
Super Gotenks 3: Defeat Super Buu w/ Goten,Kid Trunks, & Piccolo(Buu Saga)
Super Janemba: Janemba + Ultimate transformation
Super Perfect Cell: Suicide Bomb + Perfect Cell
Super Saiyan 2 Adult Gohan: Defeat Android 18 w/Hercule(Buu Saga)
Super Saiyan 2 Goku: Defeat Majin Buu w/Supreme kai & Adult Gohan(Buu Saga)
Super Saiyan 2 Vegeta: Defeat Super Buu(Gotenks Absorbed) w/ Goku(Buu Saga)
Super Saiyan 3 Goku: Defeat Majin Buu w/Majin Vegeta(Buu Saga)
Super Saiyan 4 Gogeta: Defeat Omega Shenron w/Super Saiyan 4 Goku & Super Saiyan 4 Vegeta(Evil Dragon Saga)
Super Saiyan 4 Goku: Defeat Super Baby 2 w/Majubb (Baby, The Avenger)
Super Saiyan 4 Vegeta: Defeat Omega Shenron w/Super Saiyan 4 Goku(Evil Dragon Saga)
Super Saiyan Adult Gohan: Defeat Adult Gohan w/Future Trunks(History of Trunks Saga)
Super Saiyan Goku: Defeat Frieza Final Form w/Piccolo, Krillin & Kid Gohan(Frieza Saga)
Super Saiyan Goten: Defeat General Tao w/Videl & Great Saiyaman(Buu Saga)
Super Saiyan Kid Trunks: Defeat General Tao w/Videl & Great Saiyaman(Buu Saga)
Super Saiyan Teen 2 Gohan: Survive the Matach against 5x Cell Jr w/Z-fighters.(Android Saga)
Super Saiyan Teen Gohan: Defeat Perfect Cell w/ Super Trunks(Android Saga)
Super Saiyan Trunks: Defeat Cell 2nd Form w/Tien(Android Saga)
Super Saiyan Trunks(Sword): Defeat Androids 17 & 18 w/Super Saiyan Adult Gohan(History of Trunks Saga)
Super Saiyan Vegeta: Defeat Metal Cooler w/ Super Saiyan Goku(Return of Cooler Saga)
Super Saiyan Vegeta(2nd form): Defeat Vegeta w/Super Saiyan Teen Trunks(Buu Saga)
Super Trunks: Defeat Perfect Cell w/Super Vegeta(Android Saga)
Super Vegeta: Defeat Cell 2nd Form w/Tien(Android Saga)
Super Vegetto: Defeat Super Buu(Gohan Absorbed) w/Goku & Vegeta(Buu Saga)
Super Yi-Shin-Long: Syn Shenron + Ultimate Dragonball
Supreme Kai: Defeat Android 18 w/Hercule(Buu Saga)
Syn Shenron: Evil dragon + Negative energy
Tapion: Beat him in Dragon Adventure
Turles: Lower-Class Saiyan Soldier + Fruit of the Gods
Ultimate Gohan: Defeat Buu w/ Super Gotenks 3 or Piccolo(Buu Saga)
Uub: Defeat Hirudengarn w/Super Saiyan 3 Goku(Wrath of The Dragon)
Vegeta (android saga): Metal-cooler movie/android saga
Vegeta (Post Namek): Defeat Metal Cooler w/ Super Saiyan Goku(Return of Cooler Saga)
Vegeta(2nd Form): Defeat Vegeta w/Super Saiyan Teen Trunks(Buu Saga)
Vegito: Defeat Super Buu(Gohan Absorbed) w/Goku & Vegeta(Buu Saga)
Videl: Defeat Zangya & Bojack w/Piccolo & Teen Gohan(Bojack Unbound Saga)
Yajirobe: Beat Great Ape Gohan w/Piccolo(Saiyan Saga)
Zangya: The flowers of evil + Galactic Warrior
Zarbon (normal form): Beat him in Dragon Adventure
Zarbon Post Transformation: Unsealed + Zarbon

Fusion Formulas
Most of the items listed (plus other Hidden Characters) are found in the Dragon Universe Mode, in the Free Events (as yellow dots), or in the Main Events (as red dots).

Android #13: Computer + Hatred
Baby-Vegeta: Baby + Vegeta (second form)
Bojack: Unsealed + Galactic Warrior
Broly: Son of Paragas + Hatred of Goku
Coola: Frieza's Brother + Hatred of Goku
Final Form Coola: Cooler + Super Transformation
Final Form Full Power Frieza: Final Form Frieza + Ultimate Transformation
Garlic Jr.: Makyo Star + Dead Zone
Giant Lord Slug: Slug + Giant Form
Golden Oozaru Baby-Vegeta: Super Baby 2 + Artificial Blutz Wave
Janemba: Saike Demon + People's Bad Energy
Kibitoshin: Supreme Kai + Kibito
Kyui (Cui): Frieza's Soldier + Vegeta's Rival
Legendary Super Saiyan Broly: Super Saiyan Broly + Breakthrough the Limit
Lord Slug: Namekian + Mutation
Mecha-Frieza: Full Power Frieza + Remodeling Surgery
Meta-Coola: Cooler + Big Gete Star
Oozaru Bardock (Great Ape): Bardock + Power Ball
Oozaru Nappa (Great Ape): Nappa + Power Ball
Oozaru Raditz (Great Ape): Raditz + Power Ball
Oozaru Turles (Great Ape): Turles + Power Ball
Oozaru Vegeta (Great Ape): Vegeta (scouter) + Power Ball
Pure Evil Majin Buu: Majin Buu + Human Gunman's Gun
Sauza (Salza): Cooler's Soldier + Armored Cavalry
Son Gohan (Grandpa): Master Roshi's Pupil + Fox Mask
Super Android #13: Android #13 + Parts of #14/#15
Super Android #17: Android #17 + HFIL Fighter #17
Super Baby-Vegeta: Baby Vegeta + Lower Class Saiyan
Super Baby-Vegeta 2: Super Baby 1 + Power from Lower Class
Super Bojack: Bojack + Ultimate Transformation
Super Garlic Jr.: Garlic Jr. + Giant Form
Super Hirudegaan (Hirudegarn): Hildegarn's Top Half + Hildegarn's Lower Half
Super Janemba: Janemba + Ultimate Transformation
Super Majin Buu, Gotenks Absorbed: Super Buu + Absorb Gotenks
Super Majin Buu, Ultimate Gohan Absorbed: Super Buu + Absorb Gohan
Super Master Roshi (Max Power): Master Roshi + Seriousness
Super Perfect Cell: Perfect Cell + Self Destruction
Super Saiyan Broly: Broly + Super Saiyan
Super Yi Xing Long: Syn Shenron + Ultimate Dragon Ball
Super Zarbon: Zarbon + Unsealed
Tao Pai Pai (General Tao): Bros. of the Crane Hermit + Memorial Campaign
Turles: Lower Class Saiyan + Friut of the Tree of Might
Yi Xing Long: Evil Dragon + Negative Energy
Zangya: The Flowers of Evil + Galactic Warrior