Oh Bah Gah! is, as his name implies, an anthropomorphised burger made of meat, cheese, tomato, lettuce, some hidden pickles, mayonnaise and ketchup. He has thin arms with gloved hands, and equally thin legs wearing Converses. He has two eyes - the left one bigger than the right one -, and a very long mouth.
Oh Bah Gah! makes his inspirited targets overreact to everything which happens to them - sometimes it's as if they were in an awards ceremony (as seen with Nate).
In line with his inspiriting abilities, Oh Bah Gah! is very over-the-top with his emotions, easily overreacting to even the most simple of antics. He most commonly reacts by exclaiming "Oh my God!". He gets intimidated easily, even by Lie-in Heart's chin.
From the moment the lion Yo-kai was summoned by Nate, Oh Bah Gah! idolised this Yo-kai of the Brave tribe. Lie-in Heart taught Oh Bah Gah! to wait until the right moment to react arrives, inspiriting people to do so.
"Ohburger" is a combination of "oh" - from his catchphrase "Oh my God!", implying that he is often easily startled and/or overreacts in many situations - and "burger" - because he has the body of a burger.
It is possible that Ohburger's Japanese name is also a play on the word "obaka" ("stupid").
The name "Oh Bah Gah!" is a combination of interjections emulating being "surprised" while together phonetically sounding like the word "Burger".