Black Baby Beel

, is a powerful entity created under Zenjūrō Saotome's Demon World training radio.

Appearance
Being an exact replica of the original Baby Be'el, not many changes of appearance are made. However, Black Baby Be'el is coloured in a black and grey tone and has no visible eyes. He retains Baby Be'el's trademark hair, pacifier and is also nude.

Personality
Like Baby Be'el, he speaks in nonsensical babbling and the typical baby language, however since he is a demon radio carbon copy, his voice has a distorted volume to it. Like Baby Be'el, has a large curiosity of things and ends up chasing a rabbit during a training session with Oga his opponent. He, like Be'el also gets bored easily, Zenjuro attempted to entertain him by buying him a Shougi set, but Black Baby Be'el soon got bored with it.

Powers & Abilities
Being the exact same as Baby Be'el, Black Baby Be'el simply possesses the Demon Lord's hidden potential using it at full power. He is shown to be very powerful being able to headbutt Oga into a boulder.

Techniques

 * Black Baby Be'el Cry: Just like Baby Be'el, Black Baby Be'el retains his crybaby personality. After getting his head stuck in a hole in a tree, He got upset and proceeded to cry. This cry retains the similar electric element of Baby Be'el's, but at a much larger scale, so large it burns the tree and creates a large chasm in the ground.
 * Flight: In desperation to escape from Oga and to locate the wayward rabbit, Black Baby Be'el revealed he had the ability to fly by flying over the chasm he had created before.
 * Tape side change: After a given set of time Black Baby Be'el requires to "change tape sides". Since he is an entity created by a radio he possesses the characteristics of being a 'tape'. 'Side A' shows he is considerably weaker, but 'Side B' shows him at full power.
 * Lord of Flies form: Baby Be'el's true form in battle harnessed first hand by Black Baby Be'el. After his apparent capture from Oga, he "Switches tape sides" and takes this form. However, Oga easily 'defeats' him by simply ignoring him, leading Black Baby Be'el throwing a confused tantrum and eventually giving up.

Zenjuro Saotome
After training in the Mapputatsu Mountains, Saotome had expected Oga to defeat Black Baby Be'el. Since he wasn't defeated and still existed, Saotome couldn't find it in him to destory him or leave him to leave into the mountains so he decided to take him home with him. Saotome acts as his caregiver and keeps him under his teachers desk.

Beelzebub IV
Being the direct subject he was created from, Black Baby Be'el shows some fondness to 'himself'. However, both show a rivalry due to one instance of them arguing for milk Oga was preparing (resulting in the discovery of Super Milk Time). When Saotome reveals he had decided to keep Black Baby Be'el, Black Baby Be'el comically grabs Baby Be'el and tosses him over.

Tatsuya Himekawa
In the anime episode Black Baby Beel Has Grown, Himekawa 'kidnaps' him due to his striking resemblance to an old statue his great-great grandfather had found which gave him good fortune. Due to its disappearance the Himekawa family grieved its loss, Himekawa believed Black Baby Be'el to be the statue and decided to keep him. Black Baby Be'el's feelings to Himekawa seem to be mutual as he is shown to hand some luck over to him.