Baoh Raihousha

If you like one of them you may like the other one. The action is similar and both animes have some kind of organization who trying to make human superweapons by using weird power sources to dominate the world, parasites and "Akira" (psychic power). I think if you like psychological animes you will like Akira more and BAOH if you like animes where the victim are on the good side and have a better personality. 

Both anime involve a protagonist who is being held hostage by scientists for research purposes in order to transform them into weapons. Both characters are capable of morphing into a strong monster that kills other people. Genocyber and Baoh have demonstrated certain character links deep inside their personalities. They are also action-packed anime with plenty of violence and gore with a dark and bleak sci-fi tone. If you liked one, you'll like the other.  

Both are from the same author, see Boah is enjoyed more if you've seen Jojo's 

Both about people who have viruses who turn in to monsters. also same gore and violence.  

Both anime have main character that fights agains some sort of evil. Both main characters have som sort of alter ege, but while in Baoh Raihousha the main character changes into it, in JoJo's Bizarre Adventure main character summons it. Both are old school OVA with lot of violence, even gore. Both anime feature parasites that resists in human brain. 

Both anime are based on manga written by Hirohiko Araki. Star Platinum's design is even similar to Baoh. While they both have different stories, they both focus on the main protagonist that uses a special superhuman ability to fight against powerful evil opponents that threaten the world. The biggest difference between the two is that the main protagonist in Baoh transforms into a superhuman monster to fight against evil while in JoJo's Bizarre Adventure: Stardust Crusaders, the main protagonist uses Stands. If you like one, you should enjoy the other.  

Both Boah and The Guyver came out in the late 1980's with similar animation and atmosphere. In both anime, the main protagonist takes on a superpower from another life form that takes over the host and gives them superhuman powers. Both are action-packed anime, filled with violence and gore. If you liked one, you'd like the other.  

Both anime have a similar dark and gritty tone, as well as similar art and animation. Both are action-packed anime, filled with violence and gore, which focus on a main protagonist who has a demon within him, and must fight not only against his enemies, but also to keep his own humanity. 

Both '80s OVAs feature a reticent young man with superhuman abilities who graphically and brutally murders his attackers. 

The main character is just a ordinary guy until suddenly he became a supernatural being with supernatural powers. If you ask me is the show gory I would tell you yes my friend 

Classic vibe of 80s action movies. Similar art, similar music, similar style. Rough, gory, heroic. Human body's durability and abilities get far beyond the limits 

Both are old-school OVA. Both have main character that fights agains some sort of evil. Both main characters have som sort of alter ego, but while in Baoh Raihousha the main character changes into it, in JoJo's Bizarre Adventure main character summons it. Both have similar old animation and are violent, even gory. Both are based on manga by same mangaka. 

Both anime are action-packed and have a lot of gore. They follow a protagonist who has been transformed into a monster and must fight other opponents, both human and inhuman.  

Boah and Ajin both have a main character who is being pursued by a villainous organization and is attempting to be killed off by scientists. In both anime, the main character is deemed a risk to others and has a companion to assist them in escaping evil. They are also highly action-packed and violent. If you like one, you'll like the other. 

Both Baoh and Generator Gawl have protagonists that have superpowers and are capable of turning into monstrous beings. They both feature an organization which experiments on humans that gives them superhuman abilities. They are also both quite action-packed as well. If you like one, you will enjoy the other.  

Another older, obscure anime. Cool concept with good violence. 

Both Baoh and The Guyver features a main protagonist that takes on a superpower from another life form that takes over the host and gives them superhuman powers. Both are action-packed anime, filled with violence and gore. If you liked one, you'd like the other.  

In both Baoh and Xam'd: Lost Memories, the main character is transformed into a superhuman monster by a shape-altering life form. Both anime's main protagonists utilize their superhuman talents to confront formidable evil opponents while struggling to retain their humanity. The main difference between the two is that Baoh is far more violent and far older than Xam'd: Lost Memories. If you like one, you might like the other as well.  

In both anime, the main protagonist takes on a superpower and can transform into a superhuman monster. The main protagonist in both series must fight against an evil organization but are also trying to keep their humanity intact. Both are dark sci-fi action-packed anime with lots of violence, blood, and gore. If you like one, you will enjoy the other. 

Both are action anime where an evil organization hold capture some sort of superhumans, where one of them escapes and is fighting against said organization. Both are extremly violent, even gory, but also shows some bonds between characters. While Baoh Raihousha is more shounen, Elfen Lied is more psychological.