With how long lived the majority of the group is, do any of them find it hard to adapt to the present day? Are they happy with the state of the world now, or do any of them yearn for the old times?

When the industrial revolution (or relevant version of it) happened, Fae had a hard time to adapt, at least compared to Cleo and Rao. Kawa had the easiest time out of the 4 oldest. Dial being a protogen is and a scientist is on the cutting edge of tech. Although Fae, Rao, and Cleo occasionally forget what is the current messaging names, referring to emails as 'telegrams', for example. Fae does occasionally miss the old days, stating things were 'simpler'. Although honestly she misses the heat of battle. Guns don't make for good sword play. Cleo and Kawa are fine with the current world, while Rao follows Dial to the future. On a slightly related note, Fae does often reverts to older forms of languages when mad, even slipping into some extinct languages.

Almost forgot. While I've never actually stated this, Lyra can live to be hundreds of years old as well, but she is actually relatively young at mid 30s

In Rao's bio she muttered "fate cannot be changed" with time manipulation. What happened that caused her to realize this fact? Did she try to change something in her past or future?

Not her future, others future. When your young, have the ability to see the future, and are generally a nice person, what would you do? Try to help people. Rao did so thinking she was helping people, in some cases saving lives. When in the end it never changed anything aside from location or cause. At best she would only delay it. She checked in on a few people she thought she helped, only to find them after what her prediction said would happen. She eventually tested it herself, made a prediction and saw a tree falling, chopped down by someone. She managed to convince the person to chop another tree down, but shortly after the tree she predicted would fall fell during a terrible thunderstorm.

Has she looked into her own future before, or is she scared of what she might find?

She hasn't, she isn't vain enough to see what her own future has in hold. But curious enough to see other's.

Fair enough. Wants to know what life has planned for her when it comes, not ahead of time.

To Rao, where are you at your most vulnerable?

When something bad happens to something she cares dearly for. Say her friends or collar.

That's understandable. What's so dear about the collar tho? 2nd question.

Her family has a tradition, once the child gets their second tail they receive one last gift made by the parents. It’s essentially the last thing she ever got from her parents.

Ah... I understand. Makes sense.

Do you allow other writers to feature your characters in their writings as long as it's suitable and fits the personality.