I’m not smart enough to do interesting headcanons, so these are very general. If you want to add or if you want me to write down more about any subject I can.
Glass Joe has a huge sweet tooth, kind of like Doc Louis but not so much with chocolate as just sweet cream or very sugary things. Joseph also has a niece that inspires him to keep boxing. She is only five, but he loves her so much that he keeps giving it his best. Glass Joe is also infertile. He wanted to have children but after a few incidents in the ring, he was no longer able to which makes his friendliness towards other children a lot more meaningful. Joseph lived in an Orphanage from when he was thirteen to sixteen years old before finally being adopted by a kind woman named Celesse Abel.
Von Kaiser was 16 when the Berlin wall was built. Not only was his father very strict on turning Kaiser into a respectable fine man with military training, Kaiser himself was keen on going to a military academy so that he could become strong enough to forget his past and forget about his family on the other side of the Berlin Wall. Von Kaiser’s full name is Friedrich Von Kaiser. He despises children, as well. The tick that he has is from him training vigorously when he was young, having been born only a decade and a few after World War 2 and wanting to be able to protect his country if there was ever any attacks.
King Hippo is possibly the most mature and intellectual out of all of the boxers. His people are all overweight, though they made him King due to his much larger mass and ability to eat five turkeys in three seconds.
Piston Honda cannot use his real name inside the ring, instead he has to change ‘Honda’ to ‘Hondo’. Piston is actually very interested in Western culture, and prefers boxing over his other martial arts that he knows and practices. Hondo doesn’t hold grudges very often. He would rather learn from his mistakes and his opponent’s tactics to find how to beat them in a more unique way. Hondo is a great artist. Piston Honda is very involved in politics involving his country, but remains quite open to many ideas and doesn’t argue much. Unless it’s a debate on figure skating. He loves figure skating so much that it’s kinda weird.
Bear Hugger is a very eco-friendly person, and boxes to raise money for Wildlife preserves or for the Canadian Military. (He is very peaceful, though.) Bear Hugger’s real name is Mathis Tremblay. Mathis is Quebecois, and enjoys speaking with Glass Joe in French. (though the different accent and slang can sometimes throw the Parisian off.) He also is very political, but keeps to himself and doesn’t normally vote on anything having to do with the government. (He wanted Quebec to become an independent Country, though. Even if he knew the consequences.) Hugger has a very low tolerance to heat.
The Great Tiger has a very enjoyable, light-hearted personality. He is very charismatic and humorous and because of this, he attracts many people. When Tiger first joined boxing, he was horrible, because he focused mainly on training himself in magic and because of this the WVBA allowed him to use magic. To spice things up! He is very pro-wildlife and likes to train in the wilderness to ‘Learn from the animals beside him’. Great Tiger is famous almost everywhere except France, Slovakia, Czech, Belarus and Poland. Tiger has a fear of being unwanted and making people unhappy.
Don Flamenco has an abusive father, that he still looked up to because his father had convinced him that every time he had hit Don, he was showing him how to fight in the boxing ring. (Even though Don’s dad knew nothing about boxing and was instead Don’s inspiration to become a Matador.) Don is suicidal because of this, though his instincts have grown past that depression after meeting Carmen. ‘Flamenco’ is not Don’s last name but rather a nickname given to him early on when he danced before a fight. Don’s full name is Donato Garcia.
Aran Ryan is extremely superstitious. He also loves his family more than anything, though he dislikes his sister. Aran hates the UK, but was not keen on the idea of Scotland leaving the UK. Aran is an avid fan of childish cartoons with dark plots, such as Steven Universe. Ryan is a violent drunk (Though he’s violent anyways.)
Soda Popinski had an alcohol problem but his wife eventually got him to drink Soda instead. (Though, he still likes to go out drinking with Aran and still loves Vodka.) Soda dislikes America. Though his main language is Russian, Soda knows many more languages and speaks with the Great Tiger in Hindi, or with Dragon-Chan (The rare moments they speak) with Chinese.
Super Macho Man likes to imitate reporters who follow him and finds enjoyment in listening to other boxer’s stories. He knows just about everyone’s past and their ambitions. Macho puts on a very egotistical guise in public but is very laid-back and can be very respectful on few occasions.
Mr Sandman has children and a wife, but occasionally they have a polygamous relationship with other boxers or friends. He is a very responsible and loyal person, and actually doesn’t get mad that often. He’s very serious about boxing though, and doesn’t want to make himself seem like a fool in front of his wife (And husbands sometimes) and children.