I couldn't think of a reason as to why you would ignore them, so you can think of your own reason.

Miho:

If it's at school, she won't even notice due how busy she is at school with everyone and the tanks. But the second she exits the school and sees you ignoring her, she will nervously ask if she did something, unsure if she is the problem or not. If you tell her she's the problem, she will gasp before apologizing then frown in confusion before nervously asking what she did wrong. So after you explained, she will apologize again, saying she will never do it again. She is good with making friends and helping, so she just had to say a few nice words for you to forgive her.

Saori:

She will immediately do research online and asking her friends if they know why you're so angry. When Hana told her the reason, she gave Hana a big hug before running to you. If it's her fault, she will apologize many times and promise to not do what angered you again. But if it's not her and just something that went wrong or someone angered you, she will promise to help you fix your problem and make you happy again. And she will stick to her problem, she will help you fix your problem till she saw a smile on your face again.

Hana:

She didn't want to make you feel pressured into talking about something if you don't wish to talk about it. She will be a bit upset you're ignoring her, but she chose to make you a beautiful bouguet in hopes it will make you happy. When she handed it, it was a bit awkward since you took it half-heartedly. But when she later saw you staring at it, deep in thoughts, she couldn't help but smile, happy her flowers that can help you think through your issues.

Yukari:

She will follow you around, hiding behind walls, bushes and cars as she films you. LAter in her room she will watch the video, watching closely for any sign of what might make you be like this. When she figures it out, she will immediately go to your house, even if it's night, she wants to talk to you right now, not tomorrow, but now. If it is night, she will just climb through your bedroom window. So after you shouting at her to get out since it is night, she and you will talk about it. You mostly talk to her just to get her out your bedroom. So when your talk was over, she flashed you a grin and said she's happy you're not ignoring her anymore before she left through your window again.

Mako:

She didn't notice since she was too busy sleeping. But when she asked you something and you ignored her, she frowned before asking what the hell your problem. When you gave her annoyed eyes, she just groaned before sitting up from her sleeping position and asking if you want to be alone or talk. When you stayed quiet, she took it as "want to talk", so she sighed, unsure how to go about this since she knows she can sometimes be too straight forward and come off rude, so she spoke slowly, choosing her words wisely.

Darjeeling:

She will sip her tea, staring at you from far away, going through her mind to find out what she did that could make you ignore her. When she was sure she had the right reason, she softly put her cup down before walking to you. She said a weird quote causing you to stare before giving her a "what the hell are you saying, woman?" face, so she just chuckled before she invited you to come drink tea and cookies with her so you two can talk about what is bothering you. So you both spent two hours sipping tea and eating snacks while talking about your problem. When the talk was over, she took your hand, giving it a kiss, thanking you for talking to her about your problems.

Kay:

She hates when people ignore her since she loves attention, so when she noticed you ignoring her, she was quick to bomb you with thousand of questions. When you glared, she glared back and tell you not to ignore her just because you are not happy and actually talk to her so she can help you. So when you began talking, she will keep quiet and closely listen to you. When you finished talking, she will pat your shoulder, assuring you it's okay before grinning and asking if you want to have your favorite food for dinner.

Katyusha:

She will begin demanding why you're ignoring her and what she did wrong. She will offer to buy you a tank to cheer you up, but when you gave her a glare, she was quick to go silent before frowning. So she will spent the rest of her day spying on you, trying to figure out what is wrong with you. When she figures it out, she will let out a gasp, amazed by herself before running to you to go talk to you about it.

Nonna:

She will stare, silent, trying to figure out what is wrong with you. When she figured it out, she will calmly approach you and ask if you wish to talk to her. If you deny, she will respect your decision and wait till you wish to talk about it or get over it. But if you do want to talk, she will make you sit down and both will have a serious talk.