's still only a small portion of him!
Big Badass Wolf: Dorulumon. There might be a chance that he will follow the footsteps of Garurumon.
Biological Mashup: DaiPenmon and IceDevimon's combined form in episode 11 looks like this as opposed to the other combinations.
Book Ends: The image of Taiki, Shoutmon, Ballistamon, and Dorulumon from Taiki's dream in Episode 1 is recreated right before the Final Xros in 54. This time, however, the boys have got everyone else backing them up against Bagramon as well.
"Ball and Chain KICK!"
Catalogs and Magazines Always Spoil: The merchandising for the show as well as the various Jump magazines and fliers showing future Digimon appearances and DigiXros combination. Additionally, the promotions for Digimon Xros Wars: The Young Hunters Leaping Through Time made it abundantly clear that Shoutmon wasn't permanently killed off in episode 53.
Catch Phrase: "I just can't turn my back on him/her!" (In Japanese, hottokenai!) Initially the catch phrase of Taiki, it eventually becomes the collective catch phrase of Xros Heart.
Channel Hop: From Fuji TV, longtime home of the Digimon franchise, to TV Asahi. Possibly justified because of what was occupying the traditional timeslot.
Conspicuous CG: In Taiki's dream in the first episode, when Shoutmon X4 was blasting the Bagra Army was his Three Victorize attack, he and the power beam were rendered in CG.
In the show as a whole however, this is largely averted for the first time in Digimon. All of the evolution scenes are CGI-free, when in previous series there was always at least two evolution scenes done in CG.
Curb Stomp Battle: The very first fight against the Bagra army isn't challenging at all.
A Death in the Limelight: Baalmon/Beelzebumon (twice) and Deckerdramon.
Apollomon and Olegmon in episode 51 as well.
Also Cutemon rape!
Dropped a Bridget On Him: Cutemon, the Pink, Scarf-wearing Healer is a boy.
Everything's Worse with Bears: Sweets Zone is full of Monzaemon and its variants.
Then played straight again with the Bagra Army's employment of Grizzmon, the evolved form of Bearmon, as soldiers.
Everything's Worse With Penguins: In the Lake Zone, Lillithmon unleashes DaiPenmon, a giant, evil penguin wielding enormous popsicles. Then he gets worse.
Everything's Worse With Samurai: Tactimon: Highly strategic, dangerously lethal, and an adversary to the heroes. Also shown to be more than just competent in combat by himself, if knocking around the heroes with a giant katana without unsheathing it is any indication.
Evolutionary Levels: Subverted. Unlike previous series, every Digimon from the introduction of Xros Wars onwards are lumped into one level, which the Digimon Dictionary calls "Digimon introduced in Xros Wars"; most fansites refer to such Digimon as having "no defined level". Most types of evolution that the enemies use rely on the similar "jogress evolution" technique, making them look like DigiXroses as well.
Then played straight in Episode 30 when Shoutmon finally got the ability to evolve into OmegaShoutmon. Note that evolution in this series is treated more like age rather than a power-up, and that OmegaShoutmon is Shoutmon's "future-self accessed temporarily with the help of Akari and Zenjiro". However, this "future" reason is played very inconsistently - accordingly ZekeGreymon would be MetalGreymon's future form... except MetalGreymon is just a DigiXros, not a single Digimon in and of himself, and so he would not be able grow up to eventually become ZekeGreymon.
Justified since the previous seasons worked this way as well. The Heroes are just able to temporarily allow their partners to access these future forms. For example, Tailmon/Gotomon's default form is Adult/Champion, as opposed to Child/Rookie due to her experiences.
Excited Episode Title: All of the titles. All of them.
Expy: Dorulumon gives the impression that he's Digimon's version of Tiger. They look similar and have almost similar attitudes. And it seems like he shares the same fate of Tiger of the Wind and Greywolf from the anime. Dorulumon was once a general of Tactimon much like Greywolf is one of the servants of Moo, and that Dorulumon serves as a temporary guardian to Cutemon until he finds its parents is similar to how Tiger treats Greywolf when they were young. Oh and the fact that one episode is labeled "Dorulumon, Run Like the Wind".
Sparrowmon is shaped vaguely like a Latios (coloured like a shiny Latias) whose attack set seems to include Stardust Mirage...
As far as previous series are concerned, Baalmon may count as a Composite Expy, sharing traits with Wizardmon including his Taking the Bullet moment, as well as with Beelzebumon to the point that his reincarnation turns him into an updated version of him.
Tyutyumon and Damemon bear particular resemblence to Chuumon and Sukamon. Except, you know, not nearly so ditzy.
Exty Years From Now: The series (or at least the manga) takes place in the year 20XX.
Five-Man Band: For the Digimon we have...
Freudian Trio: Taiki (ego), Akari (superego), Zenjiro (id). Later Nene (ego), Taiki (superego), Kiriha (id).
Giant Enemy Crab: Ebidramon, a giant lobster dragon thing. And yes, Taiki attacked its weak point steamrolled it For Massive Damage. With a summoned LEVIAMON.
Gratuitous English: Most of the Digimon's attacks, as usual. Taiki often says, "Thank you," and Starmon calls all the guys "brother."
Green Lantern Ring: The Xros Loaders can merge Digimon into any tool or weapon necessary - hammers, axes, swords, shields, slingshots, helicopters, etc.
Hand or Object Underwear: Taiki and Zenjiro use Starmon and the Red Pickmon, respectively, to preserve their modesty while in an onsen.
Heel Face Turn: Baalmon, Nene and Kiriha.
Highly-Visible Ninja: Monitamon. This trope might as well be outright invoked with Hi-Vision Monitamon.
Olegmon is defeated by Ballistamon's Ultimate Speaker, a sound-based weapon he installed in DarkVolumon, to enhance the destructive power power of his voice.
Humble Pie: Poor Kiriha.
Humiliation Conga: This happens to DeathMeramon in the Magma Zone arc; he goes from being a Badass that trounches Shoutmon X2, to being beaten by Shoutmon X3, Shoutmon X2 (who he'd defeated before), and is then finally taken out by Shoutmon alone after being wittled down by his previous defeats. Episode 10-11 are dedicated to this on IceDevimon.
Shoutmon is great at these: He intentionally had himself crossed with NeoVamdemon to talk to the remnants of MetalGreymon, who he had absorbed. He does it again later with Ballistamon to snap him out of his short stint as Dark Volumon.
Internal Homage/Mythology Gag: A kind of cross-series Laser-Guided Karma version. Baalmon is an Expy of Beelzebumon, and Lilithmon kills him by stabbing him in the stomach with her claws.  By stabbing him in the stomach with his claws. It is undeniably intentional after Baalmon is reincarnated as Beelzebumon.
It Only Works Once: DigiMemories... or once a Zone. That said, only one or two DigiMemories have been reused, probably to allow maximum exposure of new ones for Call Back value.
Taken to ridiculous levels is G[7]Cutemon in which he obliterates an entire legion of Gravimon's army.
Killed Off for Real: Deckerdramon and Beelzebumon (nope, he didn't just turn into something else the second time). However, the Code Crown revived them in the finale along with Shoutmon who got killed in the penultimate episode.
Laser Sword: The Rare Star Sword, formed when it includes the red Pickmon.
Meaningful Name: Zenjiro Tsurugi[8]; he happens to practice Kendo. And what's the biggest way he's helped Xros Heart so far? Attacking Digimon with swords.
Miss Exposition: Nene.
Tropes Are Not Bad. It works really well in episode 25, as despite the hectic and intense battle, Blastmon's... er... mentality shines through.
Morality Pet: Sparrowmon for Nene.
Ms. Fanservice: Mervamon... my god...
Episode 46.