Moka Akashiya's (Rosario + Vampire) true form, Inner Moka.
The Archfiend Vazdah (Ninja Gaiden II) in his true form.
Edrad Liones's (Bleach) true form Volcanica.
The true form of the two Zangetsus.
The true form of Ichigo's Tensa Zangetsu.
Komamura and Kokujō Tengen Myō'ō: Dangai Jōe's true forms.
Orochimaru's (Naruto) true form.
Kid Buu (Dragon Ball Z) is a Pure Majin, the true form of Majin Buu.
Link's Master Sword (Legend of Zelda) in it's true form after being blessed by Hylia's mortal form, Zelda.
Whenever Ryu Hayabusa (Ninja Gaiden series) places the Eye of the Dragon into his Dragon Sword, it becomes the True Dragon sword. In this state, the blade brims with the power of the 12 Divine Dragons and becomes a weapons of immense power.
Sora (Kingdom Hearts) in his final Drive form.
Sol Badguy (Guilty Gear) in his true form, Dragon Install.
Chakravartin (Asura's Wrath) in his final form as "Chakravartin the Creator".
Envy (Fullmetal Alchemist) has two true forms: the monstrous reptilian form when empowered by the souls of the population of Xerxes (above), and the helpless little lizard form when most of his core is damaged (below).
Chase Young (Xiaolin Showdown) in his true lizard form.
White Raven is Raven's (DC Comics) most primal, significant, and powerful version, mostly shown as a symbol of her highest hidden power and her inner purity against the consuming evil of her father
Marluxia's (Kingdom Hearts) final form.
The Master Core (SSB4) in it's true form after being defeated in it's other forms.
The Master Core (SSB4) is the true form of Master Hand.
Rushu (Wakfu) in his true form.
Shadow the Hedgehog (Sonic the Hedghog)
Krishna (Hindu Mythology) revealing Vishvarupa/God-Form, to Arjuna who's unable to bear it (Baghavad Gita)
Lille Barro (Bleach) is able to enter his true form upon decapitation.
Kamen Rider Kiva (Emperor Form)
Like must others Etherious Demons, Mard Geer (Fairy Tail) is able to transform into his true Etherious Form.
Jackal's Etherious Form (Fairy Tail)
Doriate's Etherious Form (Fairy Tail)
Franmalth's Etherious Form (Fairy Tail)
Ezel's Etherious Form (Fairy Tail) Slash Attack Mode.
Kyouka's (Fairy Tail) Etherious Form.
Torafusa's (Fairy Tail) Etherious Form.
Tempesta's (Fairy Tail) Etherious Form.
Hoopa (Pokémon) in its true unbound form.
Zygarde (Pokémon) in its true form with 100% of its cells.
Groudon and Kyogre (Pokémon), in their original, "Primal" forms.
Ultra Necrozma (Pokémon) is the true, original form of Necrozma.
After reabsorbing the final fragment of its essence from Sonic, Dark Gaia (Sonic Unleashed) was able to fully mature and reassume its true form, Perfect Dark Gaia.
When granted access to Six Paths Chakra by the Sage of Six Paths, Naruto Uzumaki (Naruto) can access a transcended version of his trademark Sage Mode...
...and access an even greater version of the Six Paths Sage Mode when he mixes his Sage Chakra with the Chakra he draws in from the Nine Bijuu's
When all of Alucard's (Hellsing) limiters are released, he takes on his true form, the infamous lord of vampires known as Dracula.
Ceresmon (Digimon) normally takes the form of an enormous, bird-shaped living forest...
...and rarely shows her true, weaker form.