Guess the Above OC's Bad Habit

Haruka has a tendency to sing ballads at a slightly rushed tempo, despite practicing them rather often

If Lilac is particularly strong, perhaps she has a habit of accidentally hurting people physically because she doesn't notice how strong she is compared to the rest?

Being both a CEO and president, he probably finds himself putting his work before anything. He probably wants to spend as much time with his loved ones as possible, but cannot ignore the work he needs to do. He eventually will feel regret for not spending so much time with those he cares for and will try to not work as much.

I have a feeling that Yuumei has a habit of drumming her fingers in a particularly loud way while she is thinking about something. Leading to situations where she is just staring off into space with that constant tap-tap-tap-tap repeating over and over. 

if Carrtier doesn't like something he does not say it right away but whispers his displeasure. He grunts quietly so only people standing close to him an hear it. And when he is nervous, he snaps loudly with his fingers. He annoys his friends with his bad habits a lot x3

When he's alone and particularly stressed or agitated (PTSD flashbacks keeping him awake at night?) he tinkers with his arm for no other reason than it hurts. It's not a pain thing, so to speak - just that focusing on the sensation of pressing a screwdriver into the rivet joining hand to wrist helps him keep his mind off of... worse memories.

She has a habit of forgetting to eat due to her busy schedule.

Since Haruka is a shibe, sometimes she will find herself doing some more dog-like things even in human form out of habit, such as trying to bark at sudden noises or other things that are startling to her.

Terra is the type person who says what she thinks, even if it's inappropriate. She can't change her bad habit because she is too direct with people. She also doesn't feel sorry for offending anyone. Terra just says the truth people don't want to hear. 

Nicolai doesn't seem to wear glasses that fit and even if they aren't slipping off he tends to push them up, when he's nervous. 

I can totally see him mimicking someone behind their back. Like, when someone is having a conversation he literally just pops in and starts copying them before disappearing when they wonder why people are laughing at them. I don't even know, I just get that feeling. XD

he probably has a problem with watching way too much anime and spending too many days staying up until 3 in the morning reading manga. basically, he has no self-control in regards to doing fun activities he enjoys.