Might as well dump some human headcanons here before I end the M!A!
Only Waverly's teachers ever call her by her full name, everyone just calls her Wavey or some variant thereof.
She goes to a musical academy and specializes in classical piano, though her favourite genre to play is ragtime.
She's very envious of people who can sing well - not that she can't keep a tune, but her singing voice is squeaky and it cracks, it's not very strong.
Her love for dancing is not as pronounced, though she does enjoy getting down. Just not nearly as much as her botself.
She lives in a small house with her dad, Cuinn (Rampart), who is a traffic cop. Her mother, Sabre, was a kickboxing coach/chef, but was killed by a burglar in their home when Wavey was 8.
She and her dad are very close, though he doesn't get too much time off. He often worries that she gets lonely, so they text each other a lot.
There is a special ringtone for her phone that she has set for emergencies - meaning that if that particular number ever calls, her dad is in serious trouble. So far it has only ever rung twice, but just the sound of it is enough to upset her.
Cuinn is crazy allergic to animals, otherwise he would've given Waverly a dog or other pet (she thinks fish are boring and doesn't really like reptiles) for companionship. As a result she loves and adores Alamo, Houston's dog. She has to lint-roll herself really thoroughly before she goes home though, so her dad doesn't swell up and die.
(Alamo belongs to the-houston-solution!)