Because some people have memory as bad as mine, but don't devote hours of their free time to writing non-smut about an Echidna's family.
 
Family ---
 
MC:  Val Trevor
 
Mom (she says 29):  Lysandra Beckford
 
Dad (45):  Steve Beckford
 
Eldest Echidna (17):  Vinata "Vee" Beckford
 
Overly protective, motherly, somewhat desperate, afraid to end up as a Kurisumas Cake.  She secretly has about five hundred boy-comics involving shirtless adventurers being turned into loving fathers.
 
Elder Wight (16):  Evette "Madamoiselle" Beckford
 
"Frustrating," trying to match all of the current trends with Wights, yet thoughtful and empathic.  She's detached from most of her family because she knows that she's going to outlive them.
 
Elder Dark Priestess (15):  Lythalia "Sister" Beckford
 
Very rational, angered by unreasonableness, secretly enjoys gardening.  She views Val as a project more than anything else, and actively attempts to correct his "twisted, unnatural ways" to make him happy.  Weirdly puts others' needs ahead of her own.
 
Same-age Apophis:  Safiya "Safi" Beckford
 
Acts monstrous but is oddly sweet, four days younger than MC.  Voiced by HanaKana.  Is perhaps the most vanilla out of all of them.  
 
Younger Werewolf (13):  Carathis "Cara" Beckford
 
Weird sensory perceptiveness, loyal, athletic, practically narcoleptic.  Her instincts are starting to awaken, but MC is just too dense to notice.
 
Wurmouto (8):  Theresa "Tera" Beckford
 
Soul-crushingly adorable.
 
 
Not Family ---
 
Ghoul childhood friend (15):  Jennifer "Jen" Green
 
Cool, bro-ish, "one of the guys."  She's always around, but never pings on MC's radar.  This frustrates her to no end, in part because she really does want to be his friend, but at the same time her instincts are going haywire.
 
Nekomata stray (15):  Rina "Mittens" Akiyama
 
Noble daughter of an ancient family line.  Powerful mage and knowledgeable thaumaturge, but also ignorant of the outside world.  She was raised by a traditionalist family, and is annoyed by the human fascination with self-determination.
 
Cherub (15):  Camisahasriel "Cami"
 
Still has a desire to help the good and innocent, swaps violently between ancient, pure, angelic figure and chuuni fifteen-year-old.  
 
Seraph (?):  Ureliah
 
Shows up for five minutes, is the last of the Valkyries.  She's angry at Val for being weak and sparing MGs, but also secretly proud that someone who would've been her charge is beefed up.
 
Ophde (?):  Zephariel
 
Sees the future, and thus is a font of glorious exposition.  
 
Lucas "Luke" Reimann and Valerie (15)
 
MCs soccerbuddy, actually a potent mage.  He left his girl because of threats from the MGs in school who wanted his D and thought that a human girl doesn't deserve it.  When Valerie dies, Lucas blames the MGs that separated them, and he begins a very long, painful journey.
 
 
Not Friends, Either ---
 
Lythalia's BFF (15):  Letitia "Tish" Williams
 
Total bitch at first, and perverted as hell.  Gets beaten upside the head repeatedly until her instincts shift from seeing MC as food to seeing him as a superior hunter.  
 
Principal Douglas (??)
 
Profoundly worrying, yet ultimately foresighted and reasonable.
 
Jen's older sister (17):  Julia Green
 
Slut, knows that MC ain't tappin' that, tryin' to get in on that action.  MC is not impressed.  Still loves her little sister, though.
 
Evette's Wight Friends (16):  Lily and Lizzy
 
Lily is a little gossip, Lizzy is a manipulator.  Both have their interest sparked in MCs shiny D when he beats Tish upside the head.