Ryuusei no Rockman

Both have magical boys; although Ryuusei no Rockman is more of a magical boy "aspect" to it- it's not technically magic; but an alien fusing with a human. BinanLove takes place in a high school; while RnR takes place in Elementary (which is obviously a shota warning o/). There are a couple girls who transform, but mostly only males (Subaru, Tsukasa, ect...) transform. So technically BinanLove wasn't the first "Magical boy" anime of it's time o / 

Yusaku and Subaru suffer depression and angst at one point encounter a cybernetic being whose homeworld was under attack aids them to become victorious in one battle to another. Wave Change and Into the Vrains have an identical concept where the character undergoes a transformation with the abilities of their partners to absorb anything in front of them. Later they ally with the female whose tragic past involved a family incident and are pop idols beloved by the masses. Then later a strong and brute rival comes in to challenge them at one point becomes corrupted to the point that they would knock sense out of them. For the most part I do see resemblance though Yugioh Vrains also takes cues from RNM3 regarding the powerful system that allows them to access a card from a mysterious server to a whole new level. Even the unreleased RNM4 has resemblance to the plot of Vrains where the mc goes rogue and forms a partner close to them having the same hacking skills to wage war against evil. VRAINS is arguably Ryuusei No Rockman anime adaptation done right being dark and realistic as opposed to Capcom's milking out of Ryuusei No Rockman anime adaptation for their advertisement. read more 

The anime version of the Megaman Starforce game, this series shares many similarities with Heroman in that 1-Both series' main protagonists are underdogs and are mistreated by their fellow classmates 2-Both main protagonists are dreamers who what to become like their missing fathers (Joey wants to be a hero like he viewed his dad and Geo wants to go to space like his father did) 3- Both come across super powered beings (Heroman and Omega-Xis) and learn to become heroes with their help. 4- In the two series, the world is attacked by aliens (Skrugg and FMians) 5- Joey and Geo are both supported by a range of varying allies 6-They both just seem to have an aura excitement! (My opinion) read more 

Both main characters are subjected to an other worldly being encounter that turns them into a hero. They as well try to keep it a secret from their close friends and/or family. Both main characters have a parent distanced from them in outer space. Both of the main characters have a strong will and determination to fight to protect. Both series have beings from another world come and antagonize the earth. 

The concept of fighting in other worlds is similar, with just a small difference. Characters "Wave in" or "Burst Link" themselves to a world that mirrors the real world, while being something completely different that masks their identities while in the other world. Not only is there a similar world concept, but fighting each other is present as well as gaining unique abilities from battling experience or even from each other. 

Both series have humans who are able to transform themselves with extraterrestrial powers and fight off evil. The alien monsters encountered in Symphogear can be the same applied as being viruses as well in this Rockman series.