Doubles are fine as long as you are respectful and don't try to "compete." Not a full list. I don't support any harmful things that are present in my sources.
Other Notable ⫶ Hina. Satori. Rin. Chen.
Don. Yuyuko. Haruka. Ichika. Tama. Nazuna.
Shizuka. Sonya. Sigma. Aqua. Tomori. Rina.
Mutsumi. Mei. Medicine. Kokoro. Kate. Nea.