I hope no one minds this gets tagged with odd one out.

They're all had the same hobby?

T34/38 said:

They're all had the same hobby?

Somewhat, related to flowers or nature like garden of sorts:
Flamebringer's evidence is from Archive File 4, first paragraph

As his time with Rhodes Island grew, we came to know that Flamebringer quite enjoys gardening, cultivating potted plants and flowers. It was quite surprising to learn he held on to such "interests."
Most operators never have a chance to learn about Flamebringer's inner self, and chalk these things up to a kind of "contrast": a deadly swordmaster returns from the battlefield to care for his flowers. That's it.

Melantha's mother was the head of her family's aromatherapy flagship shop from Archive File 1

Her mother is the head of the family's aromatherapy flagship store in the heart of Londinium.

Perfumer and Podenco are in the "Convalescence Garden" from their profiles alone.

Myrrh creates her medicine/healing from herbs and other ingredients from nature from Archive Files 1 and 3

Archive File 1
Myrrh has unique insights into the pharmaceutical sciences, and is always keen to seek out new ingredients in nature.

Archive File 3
Operator Myrrh's herbal mix was deemed a great medicine, but it has all the drawbacks of a premodern pharmaceutical: Uniquely indigenous ingredients, complicated creation processes, extremely bitter taste, and even elements of witchcraft as part of the recipe.

Suzuran's is from her token's description.

I'd include Matoimaru, who loves floral arrangement, but I'm aware that this about gardening and flower cultivation.