GENERAL:

Both non-combatants; their fields tend to last longer in employ due to safety from combat and a longer age to retirement.

They were off on other planets on scouting/fieldwork assignments during the Frieza Force's major purging events (Namek, both trips to Earth, etc.) by coincidence and sheer luck.

Sorbet legitimately didn't know they were out there.

Due to their long-time service to the Force, they also serve as head counselors/advisors to Frieza.

BERRYBLUE:

Nanny and pseudo-mother figure to both Frieza and Kuriza

High-ranking nurse in the med bay

Temporarily commanded the Frieza Force with a surprisingly tough whip between Frieza's two resurrections

Can swap from sweet and motherly to snappy and snarky on a dime

Now uses a cane in her old age

Kuriza called her "Mama" for the longest time until he learned the truth from Frieza that she wasn't actually his mother. The relationship was strained for a bit, but it eventually recovered. She's usually "Miss Berryblue" now, but he occasionally slips up.

The go-to chaperone for Kuriza's visits to Earth when Frieza's busy

Due to retire but claims that she's staying as long as Kuriza still needs her; Frieza won't admit he's stretching reasons for her to stay

Retires from the Force when Kuriza's around 14 (Age 796) leaving Frieza to deal with the latter half of adolescence, good luck buddy

KIKONO:

Part of the science division, specializing mainly in tech

If there's a signature Frieza Force-patented innovation, there's a good chance Kikono had at least some input on it.

Tries to admit that he's aging gracefully

Exact opposite of the "grandpa getting frustrated with new technology" trope; he welcomes the innovations and adapts rather easily

Wears a pair of reading glasses (to show that time had passed /ref)

Third in line on Kuriza supervising duty (following Frieza and Berryblue of course)

Initially very resistant to the idea of having to babysit a small child, but has his mind changed when he realizes Kuriza is very quiet and keeps to himself, and, when he does speak up, he's usually curious about what Kikono's working on. He soon comes to very much appreciate Kuriza's presence. Feels like he's talking with someone who actually appreciates when he rambles.

Usually referred to as "Mr. Kikono" by Kuriza, but he won't admit out loud that he misses when he'd call him "Kiko"

Tends to be the one-person welcoming party when Kuriza and Berryblue/Frieza return from a trip to Earth

I will sidetrack with a story of the day Frieza first met Beerus...

Thanks to @lilfriezatyrant​ for bringing it to my attention! From a bonus section in Volume 12′s manga release.

Credits to pipoaroi & JaredHendrix6 on twitter for English translations!