BrotherBand

BrotherBands
BrotherBands are a recurring theme in the MegaMan Star Force series. They are bonds formed by close friends using EM waves. When two people form a BrotherBand, they can contact each other at any time. They also learn their friend's secrets so BrotherBands are only formed by people that really trust each other. They can also be formed between planets like Earth tried with Planet FM

Forming BrotherBands with others allows you to gain a "Brother card", a white card that can function as one of the Brother's favourite cards, or grant you their transformation (depending on the game).

MegaMan Star Force
Geo forms his first Brotherband with Sonia after releasing her from the control of Lyra. Then he becomes Brothers with Luna after releasing her from the control of Ophuica. Bud becomes his Brother after saving them from Jammers. Zack becomes Brothers with Geo after he gives him self confidence by telling him that he helped save Echo Ridge. At one point, he cuts all his Brotherbands after Omega-Xis leaves him and he becomes depressed and lonely again. But after fighting with him against the FM-ians, he restores his Brotherbands.

In this game, Brotherbands grant special abilities to the player, depending on who they are formed with. For example, forming a Brother with Sonia grants First Barrier and Undershirt, and forming a Brother with a Pegasus player grants a +1 to Gauge speed.

MegaMan Star Force 2
Geo recieves a Star Carrier which introduces the concept of Link Power. It grows higher the stronger a BrotherBand bond is. Sice he lost his Transer, he has to recreate all his BrotherBands. The game also introduces a section for real Brothers and an Auto Brother who can function like a real-life Brother. Sonia temporarily cuts her Brotherband with Geo to convince him she was his enemy but restores it later after she stops working for Vega.

Forming Brothers in this game will increase your Link Power, which in turn can be used to equip several Ability Waves. In-game Brothers can grant you up to +100 Link Power each, while real-life Brothers grant up to +150 Link Power, depending on how much of the game the person has finished. Forming Brothers across different versions are important so as to be able to use the advantages granted by Double Tribes and Tribe King.

MegaMan Star Force 3
Much like the second game, BrotherBand grants boosts to your Link Power. This time, though, you can form BrotherBands with even more in-game NPCs, by helping complete sidequests. Real life Brothers grant you their Brother cards, which allows for the player to Merge Out with their own Noise Change, in addition to the original roulette.

Shooting Star Rockman
BrotherBands aren't shown to be formed by people but there is a large BrotherBand satellite that was used to try and form a BrotherBand with Planet FM. It broadcasted until Cepheus withdrew the FM-ians from Earth. Then it shut down.