Cole MacGrath and Evil Cole MacGrath use a number of the abilities they could learn in Infamous, like the Thunder Drop, Redirect Rocket, Firebird Strike and Tripwire Rocket, all of which act very closely to how they're originally used.
Dante's first stage entrance has him striking the pose from the Devil May Cry 3 box art.
One of his palette swaps changes his coat to resemble that of Vergil from Devil May Cry 3.
His second victory pose has him twirl around Ebony and Ivory, similar to how the previous Dante would in his Marvel vs. Capcom 3 victory pose; itself based on the same pose Old Dante would strike in Dante's Awakening.
Many of his quotes are taken word for word from Devil May Cry 4, most of them directed at Nero.
"So...you're looking to play, huh?" note said before the tutorial boss fight
"I've got some time to kill" note also said during the tutorial
"Looks like you had a trick up your sleeve" note although not verbatim, said after discovering Nero's Devil Bringer
"Adios kid" note said at the end of the tutorial
"You cooled off yet?" note said after his and Nero's second battle
"What a punk" note referring to Nero
"I think that look suits you better" note said to the Echidna the She-Viper after beating her
Emmett Graves's unlockable outfit is his Space outfit. His DLC outfit is his brother Logan Graves.
Fat Princess' kill taunts and are frequently taken from lines said by her soldiers, such as "A E I OWN YOU!" and "Prepare to be pwned!" along with the popular "Don't make me slap you!"
One of the selectable Taunts she can use during fights is called "Ready For This Jelly[?]", which is part of the lyrics to Destiny's Child's song "Bootylicious". Double points in that the Taunt involved Fat Princess shaking her butt at the opponents.
His Up+Circle has him throw a Tekken Bowl pin. Every so often, he will instead throw out the beach ball used in Tekken Ball.
One of his ending outros has Kuma dancing for him while he claps, much in the way the bear did during his Tekken Tag Tournamentending.
His Pre-Order Bonus costume is his long coat alt-outfit from Tekken 3. The dev team has affectionately taken to calling him Pimp Heihachi. His alternate costume ages him up and gives him his fundoshi from Tekken 4.
It should be noted that SuperBot lead designer Omar Kendall is a mondo Tekken-fan. note his main is Ling Xiaoyu The amount of dedication shown to Heihachi's easter eggs shouldn't be surprising.
Isaac's Level 3 super appears to take more than a few cues from Asteroids, and other such games.
His unlockable outfit is his CEC Engineering Suit from the first Dead Space, while his DLC outfit is based on the Elite Advanced RIG from 2.
His intro and ending cinematic feature Ellie Langford from Dead Space 2 and 3.
His Pre-Order Bonus skin gives him back his outfit from The Precursor Legacy... however, he doesn't lose the tougher looking face (though he does lose the goatee). His alternate outfit is his racing outfit from Jak X.
Kat's unlockable outfit is her Military Uniform from Gravity Rush's DLC. Her DLC outfit is her Spy Catsuit also from 'Gravity Rush'' 's DLC.
Kratos's alternative colors come a few references. One of them gives him a blue tattoo scheme, which would've been his final design◊ were it not for David Jaffe changing his mind. Another costume colors him entirely black ala Fear Kratos from GoW3 and the last gives him the Ghost of Sparta color scheme (monochrome with Kratos' tattoo highlighted in red) from the game of the same name.
His Pre-Order Bonus casts him as his brother Deimos. His alternate costume gives him his Morpheus armor from God of War III.
Her Pre-Order Bonus outfit was taken from the ending of Heavenly Sword while the Shen's Armor unlockable outfit was inspired by her father.
Nathan Drake's arcade-mode opening takes place in the beach bar most famously seen at the start of Uncharted 2: Among Thieves.
He gets to wear his winter gear◊ from Among Thieves in his Pre-Order Bonus skin. His alternate outfit is his desert outfit from Drake's Deception. Another DLC outfit of his uses the scuba gear from the first game.
PaRappa's Level 3 Super has Lammy, Sunny Funny and Chop Chop Master Onion in the crowd (among others). It also has the screen start to look like his game's interface.
His arcade-mode cutscenes are closely rendered as if they took place in the PaRappa the Rapper anime.
Listening closely to his Boxy-Boy-based attacks reveals that they put out Run-D.M.C. samples.
His Pre-Order Bonus outfit is his alternate astronaut outfit from Um Jammer Lammy. His Funky Gi alternate came from an episode of the anime.
Some players noted the similarities between his Level 1 Super (Romantic Karate) and Guile's Flash Kick, which lead to the creation of this. The game's official website even describes it as "Parappa does a flash kick in the air that sends off a burst."
Radec's dialogue is heavily influenced by lines in Killzone. When selected, he'll say "As you wish" to the player, something he's said to Scolar Visari, founder of the Helghan Empire; he could also warn the player that he's not a very patient man, said to Evelyn Batton. "Kill or be killed" and "Nothing but a speed bump!" is adapted from his Boss Banter, "The essence of combat: kill or be killed!" and "You're nothing but a speed bump on the road to destiny" while "This will be a day of mourning" was a line said by Visari originally as "I want this day to be a day of mourning for the ISA."
One of his defeat animations has him sprawled on his back, clutching his wounds while trying to keep his pistol steady, identical to his death scene in Killzone 2. Of course in that fight he decides it makes more tactical sense to turn the pistol on himself
His Pre-Order Bonus outfit gives him a jetpack from Killzone 3. His alternate outfit turns him into one of the Helghan Army's Capture Troopers (not the Elite Shock Troopers described in the game).
Raiden's chained-up pose in Heihachi's Level 3 Super seems to reference his infamous torture scene in Sons Of Liberty.
One of his alternate colors causes him to resemble Grey Fox, possibly a reference to the fact that Grey Fox was originally planned to be the main character of Revengeance.
His level 3 has him cut down enemies who are hiding inside cardboard boxes, a reference to the series' primary hero Solid Snake. Boxes that do not contain enemies are filled with watermelons; this is a reference to watermelons being used as dummies for demos of Metal Gear Rising: Revengeance and a tactic Snake used to distract a Gekko in Metal Gear Solid 4.
His third outro has him striking the pose from the Japanese cover◊ of Revengeance.
Sly Cooper's kill quote "You are stew-pid" is a reference to Jean Bison, a bad guy from Sly 2: Band of Thieves.
His level 2 super is a homage to the final boss battle of the very first Sly game.
His Pre-Order Bonus costume dresses in his archer costume from the Medieval England period seen in upcoming (as of the reveal) Thieves in Time. His alternate outfit is another costume from Sly 4, the Arabian Disguise.
His Pre-Order Bonus costume is his battle-gear from the Japanese-exclusiveMillion Monkeys. His unlockable alternate outfit is a "Classic Throwback Suit", combining his shirt from the original Ape Escape, his black undershirt from Pumped & Primed◊, his pants from the first season of the anime◊ and his goggles from Million Monkeys.
Sweet Tooth's kill-quote "That's it, boys and girls!" can be considered a reference to the way he refers to the audience during his narration of Twisted Metal: Black and Twisted Metal (2012).
The missile fired in his Level 2 Super is taken directly from the Nuke Mode in Twisted Metal (2012). He steers it using a DualShock 3.
Polygon Man's introductory quotes are taken from the written advertisements he was featured in. He also says You Are Not Ready, which was a slogan used for the original PlayStation.
Other Shout Outs:
The Power Meter from Hot Shots Golf shows up when the golfers are about to take their swing in the Sandover Village/19th Hole stage, also serving to warn the players to dodge the oncoming hail of golf balls.
If a player can score 3 kills inside a single Super, colorful block-letters reading "Nice Shot" will flash across the screen.
"Fever" appears on the top right corner of the Hades stage when the Patapon are getting ready to throw their spears on the stage.
The level editing content thermometer from LittleBigPlanet shows up in the Dreamscape/Buzz stage.
During the second half of the Dojo stage, Chop Chop Master Onion will knock down all the walls and re-appear later over-looking the stage from the background as a giant. In PaRappa the Rapper, he'd only do this if the player scored enough Cool ratings.
Looking at PaRappa Town after Chop Chop Master Onion knocks down his walls reveals various locales from the first game.
The opening of the San Francisco stage has Mission Control communicating to Echo Team (aka, the elite Sentinel team led by Nathan Hale) with the HUD looking like it was ripped straight out of Resistance. The user-interface displays the M5A2 Folsom Carbine with 30 rounds and two launching-grenades loaded.
The gravity in Time Station will decrease whenever Specter uses the time machine, just like in Ape Escape.
Specter's dialogue is heavily reminiscent of things he's said throughout the series.
"I'll prove to you just how great my powers are!" (said in Ape Escape)
"Hello human friends how are you[...] Sorry, but you just don't stand a chance[...] This should be a lot of fun." (all said in Ape Escape 2)
"Now I'll prove to you how my magnificent power can bring you down!" (said in On the Loose)