Ventus bears an uncanny resemblance to Roxas. bearing identical facial features. Further highlighting this resemblance is Ventus' outfit, which is strikingly similar to Roxas' own Twilight Town clothes. He wears a jacket that resembles a fusion of Roxas' jacket (white on the right side) and Sora's jacket in Kingdom Hearts II (black on the left side), also reminiscent of the Yin and Yang symbol. The collar of the jacket is red and pleated, again, similar to the collar on Roxas' own jacket. Underneath this, he wears what appears to be a grey vest with a single button and several white, angular patterns on it. He wears a third layer under this, in the form of a plain, high-necked, black shirt. He also has a chunk of dull green and grey armor on his midsection that appears to be under his vest, and another piece of armor on his left shoulder. Master Eraqus wears a similar piece of armor, though more blue-green, and more obvious. Ventus' pants are also similar to the pants Roxas wore, though Ven's balloon outward slightly before closing up about halfway down his legs, similar to caprice pants. These pants are colored in shades of grey, black, and white. He also wears an ornate, dull green and grey piece of armor on his upper-left arm, along with a black and white checkered wristband that is, once again, strikingly similar to Roxas', but with white edges as opposed to Roxas' black-edged wristband. Like Aqua, he wears two criss-crossing straps on his chest, on which he wears a silver Keyblade Master emblem. His boots are rather odd when compared to Aqua's and Terra's, as they resemble an armored version of normal street shoes in shades of dull green and grey.
Ventus' mannerisms are also echoed by Sora and Roxas; in particular, when standing around he often places his hands behind his head, in the same stance that Sora uses. Another example is in the opening video; Ventus is shown falling through a Station of the Dive to the Heart due to the Kingdom Key and Soul Eater shattering the pillar, in a similar way to how Sora and Roxas fall from shattered Stations at the beginning of their games. At the beginning of his episode at the Land of Departure. Ventus falls asleep outside after watching a shooting star, and a little while later, he yawns, and then is startled to find Aqua standing over him, who giggles upon his reaction and teases him affectionately, mirroring how Kairi startled Sora awake in the original Kingdom Hearts.
Ventus, Terra, and Aqua summoning their Armor.
When touching the piece of armor on his shoulder, Ventus becomes fully clad in armor. In Birth by sleep . Ventus' suit of armor shares the coloration of the pieces he normally wears, predominantly sporting shades of green and gold. In this suit, Ventus adds a yellow cape to his outfit that is discolored, almost appearing rusted. The armor on his knee is gold and bears a sharp, upward-pointing hook on the outer side of each one. Ventus' helmet has a notably different design from Aqua's and Terra's, appearing more squashed and flat at the top. His helmet also has two prongs on either side of his head which point backwards and angle diagonally upward. Strangely, Ventus' boots are colored completely gold in this outfit, as opposed to the multi-colored ones he normally wears. In Kingdom Hearts Birth By Sleep. Ventus' armor is altered. He loses his cape, his boots change to more closely resemble those in his unarmored state, and the coloration changes much more than Terra's or Aqua's. Ventus' armor loses the greens entirely, now sporting steel blue, gold, and black armor, with several red lines decorating it.
Ventus is the youngest of the three Keyblade warriors. Personality-wise, he has many similarities with Sora; he's sweet, cheerful, curious, and gets excited at anything new or interesting, but he feels disappointed whenever Aqua and Terra refuse to allow him to join them on their missions because they do not want to put him in "harm's way." When he gives them their passes to Disney Town, he grudgingly mentions that Scrooge McDuck told him to "take two grown-ups," but he doesn't seem
to dislike his status as the youngest of the three.
He also makes new friends easily in different worlds and really cares about his best friends Terra and Aqua, viewing Terra as an older brother. Ventus is very much unable to cope with Terra turning and subsiding to the darkness in his heart. Some of his traits and personality might have passed on to Sora when his heart joined him. Along with his kind personality, he also shows a lot of bravery, especially evident when he battles Vanitas for the final time, where he promises to fight for his friends no matter what, knowing the fact that he would lose his heart as a result.
Ventus utilizing his exclusive Command Style, Fever Pitch.
Keyblade and fighting style
Out of the main protagonists of Kingdom Hearts Birth by Sleep. Ventus is the fastest and most agile, which reflects in his primary fighting style of dodging, quick movements and swift combo attacks. Ventus has an affinity for the wind and Light elements and mixes both into several of his techniques and magic attacks.
Ven's primary battle style consists of very fast, wide backhanded strikes with his Keyblade in quick succession to deal damage. His single strikes aren't as powerful as Sora's two-handed strikes or Terra's powerful blows, but his ability to attack quickly makes up for his lower attack power.
In addition to his swift standard attacks, Ventus has access to a variety of exclusive attack commands in Kingdom Hearts Birth by Sleep. Ven can use his natural affinity for acrobatics to unleash an extended version of the Ars Arcanum-Combo and exhibits advanced Keyblade-throwing abilities like Wind Raid, Spark Raid and Treasure Raid. Using his wind affinity, Ventus can use Tornado Strike to sweep his opponents away. Another exclusive, ultimate attack, Salvation, enables Ventus to use his light affinity to its fullest. Ventus also makes heavy use of his wind powers in his personal finishing commands, the Air Flair series and his ultimate finisher, Stratosphere. Lastly, Ventus has another "Finish" Command exclusive to him, which is called Celebration.
Although not as skilled in magic as his classmate, Aqua, Ventus has access to a broad variety of magic spells as well as two spells exclusive to him in Kingdom Hearts Birth by Sleep. These two spells are Tornado and Faith. Tornado creates a powerful gust of wind that absorbs enemies, while Faith creates a powerful burst of light around Ventus.
Beside a variety of these abilities usable by all three or two of the protagonists in Kingdom Hearts Birth by Sleep. Ventus has access to three unique Command Styles and two exclusive Shotlocks. His first personal Command Style, Fever Pitch, which is gained near the beginning of the game, lets Ventus use his speedy combat style to its fullest. The second exclusive Command Style, Cyclone, is a powerful 2nd level Command Style which has Ventus use his wind powers to attack with wide-ranged spinning slashes in all directions. Ventus' third exclusive Command Style is called Wingblade. By activating this second level Command Style, Ventus discards his Keyblade in exchange for six silver-white glowing swords of light which float behind him like six glowing wings, reminiscent of the picture of a Seraph, a six-winged Angel.
Ventus also has access to two unique Shotlocks, as well as a third just for storyline purposes. The two freely usable Shotlocks are Pulse Bomb and Multivortex. The third exclusive Shotlock is Dark Link, which can only be used when in a Dimension Link with Vanitas in Ventus' final battle.
Small and spry, Ventus has access to the already well-known Dodge Roll technique, as well as an offensive variant named Thunder Roll. Furthermore he can use the Glide and Superglide abilities as well as another offensive version called Fire Glide. The Reversal command allows Ventus to quickly dodge an enemies attack and rush behind it, similar to the Reaction Command in Kingdom Hearts II used against the Dusk Nobodies.
Ventus becomes a D-Link for Terra and Aqua, after they receive the Wayfinders Aqua made for the three of them. While in link with Ventus, they can use swift and quick commands, reflecting Ventus' swift fighting style.Source: disney.wikia.com