Daida's older brothers
Midori is the eldest of the three and was sired by a typoon spirit, making a wind giant. Sporting two horns and 4 impressive fangs. Since spiirts of typhoons often take the form of wolves Midori as some cainine qualities including ears, tail, claws+pads on all 20 fingers along with fur in a few places . Being a wind giant he is near constantly farting, with a force intense enough to fell trees or blow down houses with out a second thought. He's very proud of his gas and is happy that his baby brother is following in his footsteps. He is an attendant is a tengu named Chairo, who spends the day bringing food to panting drooling master
Murasaki is the middle brother, sired by a river god and born a rain giant. Though only born with one horn, Mura is the tallest and most...robust of the 3 brothers (biggestest ass, gets it from mama). Due to his site Mura has some qualities of a water dragon including webbing on his hands and patches of shiny scales. He is a playful ditz that is constantly drunk and has hardly any control over his bladder. Without warning he will lift his yukata and squat to let loose a flood of piss (along with a few logs) regardless of what or who is below him (Needless to see Murasaki doesn't wear underwear) His attendant is a nervous kappa named Kiiro, who is always carrying a magic umbrella (and is tempted to ask Aoi where they source diapers)
Other stuff
All three brothers possess extra limbs, a mark of divine blood
Their mother is loud and proud she-oni, Akami, and she defiantly gave the gassy genes to all her childrens
She still loves them dearly, but in oni culture, it is the norm to let your children fend for themselves past a certain age. Daida has only been away from her for about a year at this point
Daida is still considered a baby by his brothers purely because his tusks haven't grown in yet; he still has four gaps in his teeth where they will one day grow
Midori and Mura are pretty close in age (by about 10 or so years which is not very long for yokai) meanwhile Daida was a bit of a surprise and is 110 years younger than his brother. Akami is definitely done having babies