EM Wave Change

An EM Wave Change, known as a Denpa Henkan (電波変換) in Japan, is performed when an EM being merges with a human in the Mega Man Star Force series. This creates a more powerful EM being that is able to interact with both other EM beings and regular humans.

Characteristics
During EM Wave Change, the human becomes part of the Wave World, and is thus subject to the same rules as other EM beings. The EM being is then able to give its powers to its compatible human, and the human is able to use Battle Cards as actual weapons.

In the anime, an EM Wave Change is more stable and successful if the EM being is merged with a host that has similar frequencies as the EM being, as a lack of compatibility can hinder their control and their battle strength. However, this can be bypassed by EM beings if they forcefully subjugate the human consciousness and assume complete control over them. However, even then, they would not be able to reach the full extent of their powers from the EM Wave Change, unless the EM being is able to enter their wave form without a human host, which the FMians were able to do thanks to Cygnus' device.

Fusion
During an EM Wave Change, the EM body and human are combined into one body with the consciousness of both, but it appears that only one of them control body, or at least part of it, as seen with Geo Stelar controlling his body while Omega-Xis controls the arm. Some EM beings, mostly FM-ians, will try to take their human partner as a host body, and attempt to subdue their human's consciousness completely, though this process can take time even if their bodies have fused (and it sometimes just freezes if the two are resisting the fusion)

Solitary
In Mega Man Star Force 2 and during the Tribe season of the Mega Man Star Force anime, Solo is shown being able to EM Wave Change without the aid of an EM being from which to borrow his power. Through simple willpower, and the effects of an "ancient Star Carrier," this allows Solo to become the EM being Rogue. However, he gains his own EM body named Laplace in Mega Man Star Force 3. Laplace, however, does not aid in Solo's transformation, he becomes a very powerful sword.

Transcoding
During the third game, the method of Wave Changing was changed. Because EM beings were converted into Wizards due to the Hunter-VG, they were unable to EM Wave Change in the normal way. Instead, Wizards could only fuse with their human counterpart using the Transcode, which instead of normal EM Waves, used the Satellite Server, which WAZA has built, and has registered every human who is able to EM Wave Change in a project known as Project-TC. Transcode resembles Cross Fusion more than EM Wave Change, because the Transcode uses data, rather than simple EM waves.

History
In the first and second game, the protagonists Geo Stelar and Omega-Xis have to find spacial distortions (signified by orange portals named waveholes) to pulse in and become Mega Man. It is not shown whether other willing characters have the same condition, although some characters appear to be able to Wave Change in any location when forced or by using an ancient Star Carrier from Mu.

In the anime and manga, however, any EM being and their compatible human can EM Wave Change by shouting the phrase "EM Wave Change! [Name], On-Air!" in a similar way to the Megamerge technique.

In the third game, Geo (and all others who have the ability) can Wave Change in any area, however the method has changed. Upon Wave Changing for the first time in the game, the Wave Changed being is assigned a "Transcode" and an ID number (Mega Man's is 003), as well with a Code Name (For Mega Man in the Japanese game, the Code Name was "Shooting Star") that is assigned from the Satella Police. After that, the user must shout, "Transcode! (name of Wave Change form)!" in order to transform. Accessing the Wave Road is done through a Wave Station, which in previous games was done by wave changing in a wavehole.

Unregistered, and thus illegal Wave Changes still use the old phrase, however.

List of EM Wave Changes

 * Mega Man (Geo Stelar and Omega-Xis)
 * Originally, Omega-Xis' partner was intended to be Kelvin Stelar, Geo's father, but the fusion failed as Kelvin's will had overwhelmed Omega-Xis' own, causing the latter to change and later defect the FMians. Omega-Xis and Geo are powerful as Mega Man, but because Omega-Xis is not in control over Geo, the strength of their EM Wave Change depends solely on Geo.
 * Harp Note (Sonia Strumm and Lyra)
 * Lyra originally attempted to subjugate Sonia's consciousness and control her, but due to Sonia possessing a more powerful will, Lyra could only assume control when Sonia would be asleep. After Lyra and Sonia officially partnered up, Sonia was the one in complete control over their form.
 * Taurus Fire (Bud Bison and Taurus)
 * It is unknown whether Taurus and Bud were compatible for an EM Wave Change in the anime, or if Taurus merely took over Bud. It can be assumed that it was more the latter, as Taurus had been desperate and needed to merge with a human to become stronger to overpower Omega-Xis. While Taurus was in control and had the advantage over Mega Man by taking Luna as hostage, Luna shouting out and commanding Bud forced the latter to cause their fusion to momentarily falter, giving Mega Man a chance to save Luna and defeat Taurus Fire. Taurus had once attempted to merge with Bob Copper, but the fusion lacked compatibility, and only made Bob turn red and go into a rage with enhanced physical strength.
 * Queen Ophiuca (Luna Platz and Ophiuca)
 * While the two were compatible for the EM Wave Change, and Ophiucus was controlling Luna, the two couldn't maintain a perfectly in tune fusion, due to Luna acting up when she was battling Mega Man, due to her infatuation over him, and Ophiucus trying to destroy Mega Man. This prevented the full power usage of their EM Wave Change, giving Mega Man the chance to defeat her.
 * Cancer Bubble (Claud Pincer and Cancer)
 * Cancer found a compatible human within Claude Pincer, however, it seemed like it did little to make Cancer powerful, and seemed to make Cancer even more childish. Though Cancer does seem to become rather strong when he went into a frenzy to try and see Sonia sing, even striking a Pulse Song attack by Lyra Note like it was nothing.
 * Cygnus Wing (Tom Dubius and Cygnus)
 * Cygnus notes that his and Tom's frequencies match quite well, most likely due to how the two lacked trust with anyone, as Cygnus had even managed to manipulate Tom into believing that all humans were out to betray him. Their fusion was powerful, allowing them to face Mega Man evenly, though Geo had been mostly holding back out of fear of harming Tom. Even after Geo attempted to fight more seriously, Cygnus Wing proved formidable, and the only chance to defeat him was when Omega-Xis managed to make Tom falter by reminding him that not all humans are selfish creatures, such as when Geo shared his food, despite being hungry. Although Cygnus Wing had been defeated, Cygnus hadn't relinquished his control over Tom and escaped with him. The next time they appeared, Cygnus had merged so deeply into Tom that Tom began to cause electrical devices to malfunction by simply walking past them, and could even turn his arm into EM waves, allowing him to use his wave powers without EM Wave Changing. When they faced Mega Man again, Cygnus Wing was more powerful than before, and despite Mega Man fighting hard and was ready to defeat Cygnus Wing, he began to hesitate when Omega-Xis admitted that this time, defeating Cygnus Wing might kill Tom. Cygnus had also managed to use Tom's intellect to create an EM Wave Change device that could help the other FMians to Wave Change without a host. At the end, Cygnus was destroyed by Mega Man Fire Leo, and Tom was freed from his influence.
 * Gemini Spark (Patrick Sprigs and Gemini)
 * Pat and Gemini were perfectly compatible in the anime, though Rey didn't exist, and Pat performing the EM Wave Change simply made him the White Gemini Spark, while Gemini was the Black Gemini Spark. While Gemini wasn't exactly controlling Pat, he had suppressed Pat's human consciousness to the point that Omega-Xis stated that the chances to save Pat was almost 0%.Gemini Spark's capabilities in the fusion made them extremely powerful, able to easily overwhelm Geo with their numbers, and even when faced alone, they proved to be a formidable opponent. Mega Man had never won a single battle against them on his own, and needed the power of the Star Break to finally be strong enough to defeat them.
 * Libra Scales (Mitch Shepar and Libra)
 * Mitch Shepar and Libra were not genuinely compatible at all, and Libra had merely taken control over him so that he could rest and recover from a wound inflicted by Mega Man. While Libra had managed to EM Wave Change with him, the fusion couldn't draw on its full capabilities, and Libra was still wounded at the time.
 * Wolf Woods (Damian Wolfe and Wolf)
 * While the two were compatible, Damien proved to have an extremely powerful will that Wolf couldn't defeat, as Damien had fought against their EM Wave Change several times. However, Wolf still had an influence over Damien, that whenever Damien would see anything round (including a football, strangely enough), Damien would gain features of their wave form, such as the tail, ears, or mouth. However, when Gemini Spark interfered and allowed Wolf to take full control over Damien, Wolf Woods proved to be powerful, especially when e would go berserk from seeing a full moon (or a projected one created by Gemini Spark). However, when Damien's girlfriend intervened, Damien awoke within and forcefully managed to expel the FMian, something that had shocked Omega-Xis, who never believed that a human would be capable of such a thing.
 * Crown Thunder (Jean Couronne XIV and Crown)
 * Crown is the first and only EM being to be able to wave change with a corpse, or spirit, as Jean Couronne XIV was dead for years, and was an earthbound spirit. Due to that, Crown Thunder couldn't leave the place of burial, but he had gained an immortal body so long as the grounds that the spirit was bound to wasn't harmed, which made him invincible to any attacks given to him. However, when the ground was damaged, Crown Thunder was being broken down and was defeated by that.


 * Rogue (Solo and Laplace)
 * Dark Phantom (Hyde and Phantom)
 * Yeti Blizzard (Yeti and Rich Dotcom / Murian)
 * Plesio Surf (Plesio and Gerry Romero / Murian)
 * Terra Condor (Condor and Shaman / Murian)
 * Kung Foo Kid (Kidd Gruff and Goat-Foo)


 * Acid Ace (A.C. Eos and Acid)
 * Queen Virgo (Queen Tia and Virgo)
 * Jack Corvus (Jack and Corvus)
 * Jammers (Human and an EM Virus)

Trivia

 * EM Wave Change is similar to the Cross Fusion in the MegaMan NT Warrior anime, and the background used when a character is doing an EM Wave Change in the anime is the same as the Rockman.EXE Stream background for Cross Fusion. The major difference is EM Wave Change doesn't shatter on emblem damage like Cross Fusion.
 * Another similarity EM Wave Change has is the sync rating. Once, Geo's mind was in turmoil when Cygnus, using Tom Dubious' body, told Geo that Omega-Xis killed his father. This caused Geo's EM Wave Change to deteriorate. This is similar to when Lan got into an argument with MegaMan and couldn't maintain the Cross Fusion due to low Sync ratings.