According to an official shirt in Ray's website, he is 6'2, making him the tallest member of the band.
Axel is voiced by Steve Greene
He has herpes according to YFMTS episode 7, where he says he has it.
According to Ray William Johnson's Facebook, Axel is expected to be singing at some point (Zombie Love Song, Bottles of Beer, Club Villain, The Stereotype Song, Mr. Douchebag, White Boy Wasted, Fight for Your Right).
Axel plays his Hi-Hat cymbal with his left hand almost always, (When playing the drums you play the Hi-Hat with your dominate hand), so Axel may be left-handed.
He appears to hate Benatar.
Axel has a pet hawk named Vincent.
Oddly enough, it shows Axel's right foot outside of his snare drum, however, when everywhere the bass drum hit animation is used he is seen hitting it with his right foot even though it's nowhere near the bass drum pedal.
He got a drum solo in "Alien".
In Tig Ol' Bitties Puff, DeeJay, and Benatar can all be seen as teenagers, however Axel isn't seen anywhere in the video, this implies that they met Axel later on.
He has a basic five-piece (Made up of a Snare Drum, a High Tom, a Mid Tom, a Floor Tom, and a Bass Drum), black drumkit, with the basic three cymbals (Hi-Hat, Crash, and Ride).
Axel also owns a dark-grey electric guitar, some kind of Gibson SG, which he seems often give to Benatar.
The only band member he doesn't appear to hate is DeeJay, as he seems to hate Benatar and thinks Puff is a douche.
It implied that he is fan of the music genre metal, as he says stuff like "This ________ is so metal!" and when he was faking his death in YFMTS episode #7 he says he sees the metal god and that he looks like Neil Young.
Axel is the only member not to have his own song (Benatar: Jupiter, Deejay: Transphobic Techno, Puff: most of the old ones).
Axel is the only one to dress as a villain in Just a Friend: The Joker.
Axel can tend to be perverted. Proofs are to find in YFMTS episodes #4, #6, #7 and #9.
Axel is seen playing bongos in Alien (Unplugged).
Axel says 'Man you look stupid' in Fight for your right (beastie boys cover) After PuffPuff sings 'Dont you leave this house if there the clothes your gonna wear.' or something along those lines.

He is the only member of the group who actually has eyes shown (with the exception of DeeJay in the Bitch Got a Penis and Grandma Got a Facebook music videos, and Deejay and Benatar in Tig Ol Bitties).
Axel thinks he's a douche.
He usually comes up with backfiring plans (as seen in YFMTS Ep. 102 and 103)
He tells bad jokes to his fellow bandmates to entertain himself on the road.
He also plays keyboard as seen in My Balls and Zombie Love Song, but this is not 100% true.
He is usually mistaken for Ray William Johnson (who somewhat looks like him and his voiced by him as well)
He thinks Benatar has no talent, doesn't deserve to be a legend and that Benatar's wack. But besides that, the two get along fairly.
He uses a lot of body language when he raps/sings.
According to an official shirt in Ray's website, he is 5'7.
He seems to have a good bond with DeeJay, calling him whenever he needs advice or is in trouble (as seen in Dookie Fresh and in YFMTS episode #5) as well as calling him his best friend which is evident since he knew him since fourth grade (as explained in YFMTS Ep. 108)
Puff was raised by his grandma, as stated in YFMTS #8, Road Rage. Why his mom and dad didn't raise him is unknown. Maybe because his mom and stepdad were alcoholics and his family poor, which is seems in Santa Hates Poor Kids.
He never removes his glasses, as seen in YFMTS #5, where he wears them even when he's in bed.
Puff appears to have anger issues as seen YFMTS #8 and Road Rage where he is claimed and proven to have a short temper.
Jupiter and Transphobic Techno are the only songs so far where Puff doesn't sing any lead vocal parts.
His license plate say "PUFF".also that YFM band van got his face on it

DeeJay's eyes were shown three times, in Transphobic Techno, Grandma Got a Facebook and Tig Ol' Bitties.
DeeJay usually fixes up the mistakes that Puff makes.
He was Puff's main singer, getting his own song, until Benatar took his place.
Puff usually refers to him as "fat boy" or "fat ass"
DeeJay is 5'8, minus the Afro, according to an official shirt on Ray William Johnson's website.
According to the fans, (plus numerous evidence from the series) DeeJay is the voice of reason in the band.
Unlike the rest of the band, he doesn't appear to hate Benatar, he may be neutral towards him, as he neither respects nor disrespects him. This is likely due to the fact that he knew both Benatar and Puff since high school.
He was voiced by Big/Regular Rob in the music videos, but in the series, he is voiced by Ricky Shucks.
DeeJay's voice is much deeper in Booty Store than it was in past videos.
After Epileptic Techno, he now wears black and yellow headphones when he plays his turntables.
DeeJay and Benatar's full names/surnames are unknown.
DeeJay has a cousin named DeeJane.
Oddly enough, zoomed out he has his yellow and black headphones on, but when it goes to show him operating his turntables his headphones are gone.
DeeJay is the only one of the band who no one dislikes, as Axel hates Benatar and thinks Puff is a douche and Puff thinks that Benatar has no talent, doesn't deserve to be a legend and that he's wack.
DeeJay seems to have a talent for telling "Yo Mama" (as well as "Yo' Grandma") jokes.
In the new music videos, DeeJay has lost a lot of weight, but still overweight.
In Alien (Unplugged) he is seen playing acoustic guitar.
In High Voltage, he is seen to have pained his right arm yellow, aswell as a yellow strip down the right side of his body, presumably in homage to his tracksuit which has 2 yellow stripes on the right hand sid

One of Benatar's eyes are shown in Tig Ol' Bitties, however, this is so far the only video that even one of Benatar's eyes are ever shown.
His talking voice is kind of high, and he speaks with a British accent. His singing voice is lower than his talking voice.
He usually carries his keytar everywhere he goes.
DeeJay and Benatar's full names/surnames are unknown.
Benatar is 6'0, according to an official shirt in Ray's website.
According to TV Tropes, Benatar went from being the band's silent guitarist/keytarist to being Puff's second singer.
In the songs is Benatar voiced by Jesse Cale (McSwagger), but in the series by Ray.
DeeJay is the only one in the series so far who hasn't expressed how he feels about Benatar, as Axel appears to hate him and Puff (as stated above) thinks he has no talent, doesn't deserve to be a legend and that he's wack.
Benatar plays piano as seen in Complicated, Text Me Back, My Balls (alt rock cover), Alien (Unplugged) and Bartender Song (Rehab cover).
Benatar's keytar used to look like a traditional bright red keytar, his current keytar has a maplewood guitar neck with an Ibanez guitar headstock and a dark red keyboard on the opposite end of it opposed to a normal keytar's keyboard being on the interior whereas his current on has the keyboard on the opposite end.
The guitar Benatar uses has changed as well. In the old animation he used a blue fender Stratocaster. In the new animation he uses a dark-grey guitar that resembles that of a Gibson SG with a flat bottom, Ebony neck, and custom Headstock.
Oddly enough, the current guitar Benatar uses, how said in YFMTS episode 4, belongs to Axel, why he doesn't use his Stratocaster is unknown.
He sings lead in Jupiter for the entire song, this is the first time Benatar has sung lead for a whole song.
Benatar is the only one who changed his haircut when YFM updated to the new animation style. This is likely to show disparity between him and Axel, as they had the same haircut in the old animation.
In Friend Zone his name was spelt as "Benetar"
He also seems to have a very wide-ranged vocabulary, using words such as pyrotechnics and autoerotic asphyxiation.
In Mr. DoucheBag he seems to be wearing black gloves.
Benatar is a Christian, as seen in "Friend Zone".
Benatar has only sworn in "Shitty G" and "Mr. Douchebag". Other than that, he has never sworn.
The first song Benatar ever sung a verse to is Grandma Got A Facebook.