The following furniture will change depending on the current Secretary"1st fleet's flagship".

Flooring

Mysterious Xmas Carpet

The "Mysterious Xmas Carpet" (謎のXmasカーペット) will have some pets roaming around some secretaries:

Secretary	Pet	Picture
Richelieu, Jean Bart, Commandant Teste	Octopus
USN FBB/BB/CV/CVB	Nevada's Goat
Gotland, Yura	Gotland's sheep
Oboro, Akebono, Sazanami, Ushio	Oboro's crab
Souya	Taro and Jiro (Sakhalin huskies)
Others	Nothing	-

Sandy Beach and Crab

The "Sandy Beach and Crab" (砂浜とカニさん) DD gun will change depending on the secretary:

Secretary	Gun	Picture
Fubuki-class, all others	12.7 cm Type A
Ayanami-class, Akatsuki-class, Hatsuharu-class	12.7 cm Type B
Shiratsuyu-class, Asashio-class, Kagerou-class	12.7 cm Type C
Yuugumo-class	12.7 cm Type D

Chair+Desk

Secretary and Admiral's Desks (with Irises and Kashiwamochi)

Secretary and Admiral's Desks

Secretary and Admiral's Desk with Irises and Kashiwamochi

The "Secretary and Admiral's Desks" and "Secretary and Admiral's Desk with Irises and Kashiwamochi" (秘書艦と提督の机 / 菖蒲と柏餅の提督秘書机) will change depending on the secretary:

Secretary	Drink	Secretary and Admiral's Desks	Secretary and Admiral's Desk with Irises and Kashiwamochi
Shinyou Bismarck-class, Graf Zeppelin-class, Admiral Hipper-class, Z1-class, Type IXC U-boat, Conte di Cavour-class, Vittorio Veneto-class, Zara-class, Aquila-class, Duca degli Abruzzi-class, Maestrale-class, Marcello-class, Guglielmo Marconi-class, Nevada-class, Colorado-class, North Carolina-class, South Dakota-class, Iowa-class, Lexington-class, Ranger-class, Yorktown-class, Essex-class, Independence-class, Casablanca-class, Northampton-class, New Orleans-class, St. Louis-class, Brooklyn-class, Atlanta-class, Fletcher-class, John C. Butler-class, Salmon-class, Gato-class, Richelieu-class, Commandant Teste-class, La Galissonnière-class, Mogador-class, Norge-class, De Ruyter-class	Coffee
Unyou, Makinami, Momo, Jean Bart, Gloire, Mogador Kongou-class, Yamato-class, Queen Elizabeth-class, Nelson-class, Courageous-class, Glorious-class, Ark Royal-class, Illustrious-class, Town-class, J-class, Gangut-class, Kirov-class, Tashkent-class, Gotland-class, Perth-class	Black tea
Drum, all others	Green tea

Chabudai Set

The "Chabudai Set" (ちゃぶ台セット) will change depending on the season.

See here.

During the saury season, food will change depending on the secretary:

Secretary	Food	Picture
Unmarried gilrs	Saury
Married gilrs	Saury feast

Secretary and Admiral's Desks Type 2 / French Ships la Table

The "Secretary and Admiral's Desks Type 2" (秘書艦と提督の机二型) and French Ships la Table (フランス艦 la table) will change depending on the season.

See here.

During some seasons, sets will change depending on the secretary:

Secretary	Set	Secretary and Admiral's Desks Type 2	French Ships la Table
Shinyou Bismarck-class, Graf Zeppelin-class, Admiral Hipper-class, Z1-class, Type IXC U-boat, Conte di Cavour-class, Vittorio Veneto-class, Zara-class, Aquila-class, Duca degli Abruzzi-class, Maestrale-class, Marcello-class, Guglielmo Marconi-class, Nevada-class, Colorado-class, North Carolina-class, South Dakota-class, Iowa-class, Lexington-class, Ranger-class, Yorktown-class, Essex-class, Independence-class, Casablanca-class, Northampton-class, New Orleans-class, St. Louis-class, Brooklyn-class, Atlanta-class, Fletcher-class, John C. Butler-class, Salmon-class, Gato-class, Richelieu-class, Commandant Teste-class, La Galissonnière-class, Mogador-class, Norge-class, De Ruyter-class	Coffee
Unyou, Makinami, Momo, Jean Bart, Gloire, Mogador Kongou-class, Yamato-class, Queen Elizabeth-class, Nelson-class, Courageous-class, Glorious-class, Ark Royal-class, Illustrious-class, Town-class, J-class, Gangut-class, Kirov-class, Tashkent-class, Gotland-class, Perth-class	Black tea
Drum, all others	Green tea

Desk for Two to Enjoy the Rainy Season

The "Desk for Two to Enjoy the Rainy Season" (梅雨を楽しむ二人の机) food will change depending on the secretary:

The secretary groups are the same category as the Naval Base Counter Bar.

Secretary Groups	Food	Picture
A, B, C, D, E, F, S, T, U	Sweet tea & sandwiches
N, O, P, R	Green tea & noodles
G, H, I, J, K, L, M, Q	Wine & charcuterie

Mikans and a Custom-made Naval Base Chabudai Table

The "Mikans and a Custom-made Naval Base Chabudai Table" (蜜柑と特注鎮守府ちゃぶ台) will change depending on the season.

See here.

During the New Year season, food will change depending on the secretary or time of day:

Secretary/Time	Food	Picture
01h-19h	Soba & tea
19h-01h	Soba & sake
DE, DD, SS, SSV	Dry Soba & tea

Admiral and Escort Carrier Desk

The "Admiral and Escort Carrier Desk" (提督と護衛空母の机) ornament will change depending on the secretary:

Secretary	Ornament	Picture
Kasuga Maru/Taiyou	Taiyou's green tea
Yawata Maru/Unyou	Mitsukoshi gift
Shinyou	Coffee and maid outfit
Kaga Kai Ni Go	Kaga's Desk
Gambier Bay	Gambier Bay's Desk
Others	Base desk

Nordic Coastal Defense Battleship Xmas Bord

The "Nordic Coastal Defense Battleship Xmas Bord" (北欧海防戦艦 Xmas Bord) will change depending on the Secretary.

Secretary	Picture
Others
Norge
Eidsvold

Hinamatsuri Admiral's Desk

The "Hinamatsuri Admiral's Desk" (雛祭りの提督執務小机) will change depending on the Secretary.

Secretary	Dolls	Picture
Others	Emperor & empress
CV, CVB, CVL	Zuikaku & Shoukaku
BB, FBB, BBV	Musashi & Yamato
CA, CAV	Takao & Atago
DE	Eidsvold & Norge

Windows+Curtains

Naval Base Counter Bar

The Naval Base Counter Bar's food will change depending on the season.

See here.

Windy Window Waiting for Rainy Season's End

The "Windy Window Waiting for Rainy Season's End" (梅雨明け待ちの風の窓) will have different curtain holdings depending on the secretary:

Secretary	Set	Picture
others	Teru Teru Bouzu
Amatsukaze	Amatsukaze twin-tails' streamers

Windows that Herald the Arrival of Spring

The "Windows that Herald the Arrival of Spring" (春の訪れを予感する窓) will have different curtain holdings depending on the secretary:

Secretary	Set	Picture
others	Hishimochi
Thonburi	Thonburi's doll and elephant plush

Decoration

Amatsukaze's Nice Personal Storage Shelf

The "Amatsukaze's Nice Personal Storage Shelf" (天津風のいい風私物棚) will have different sets of clothes depending on the secretary:

Secretary	Set	Picture
others	Amatsukaze's uniform
Amatsukaze Kai Ni	Amatsukaze Kai Ni's uniform

Coastal Defense Ship's May Decoration

The "Coastal Defense Ship's May Decoration" (海防艦の五月飾り) will have a different 1st plush depending on the secretary:

The rest of the set also vary, such as the 2nd plush being Etorofu variations.

Secretary	1st plushe	Picture
Shiratsuyu-class Matsu-class Mikura-class	Kurahashi
CA/CAV Type D Kaiboukan	Kaiboukan No.4
CV(B/L) Ukuru-class	Inagi
BBV CL/CLT Hiburi-class	Daitou
BB/FBB Hatsuharu-class Shimushu-class	Hachijou
Etorofu-class Other ships	Sado

Inagi's Personal Belongings Shelf

The "Inagi's Personal Belongings Shelf" (稲木の私物小棚) will have a different set depending on the secretary:

Secretary	Set	Picture
others	Inagi's uniform & belongings
Inagi Kai Ni	Inagi Kai Ni's uniform & belongings

Hatsuzuki's Personal Belongings Shelf

The "Hatsuzuki's Personal Belongings Shelf" (初月の私物棚) will have a different set depending on the secretary:

Secretary	Set	Picture
others	Hatsuzuki's uniform & belongings
Hatsuzuki Kai Ni	Hatsuzuki Kai Ni's uniform & belongings

Ooi's Super Personal Belongings Shelf

The "Ooi's Super Personal Belongings Shelf" (大井の超私物棚) will have a different set depending on the secretary:

Secretary	Set	Picture
others	Ooi's uniform & belongings
Ooi Kai Ni	Ooi Kai Ni's uniform & belongings

Preparation Shelf for Summer Beach Trips

The "Preparation Shelf for Summer Beach Trips" (夏の砂浜への出撃準備棚) will have a different swimsuit set depending on the secretary:

Secretary	Picture
Others
Yamato
Haruna
Kinugasa
Shigure
Richard P. Leary

Furniture+Shelf

Dressing Room

The "Dressing Room" (脱衣所) will have different sets of clothes depending on the secretary:

Secretary	Set of clothes			Picture
Secretary	1st Row	2nd Row	3rd Row	Picture
FBB	Kongou	Haruna	Towel
CV	Akagi	Kaga	Towel
CVL	Junyou	Ryuujou	Towel
DD	Fubuki	Mutsuki	Yuudachi
SS/SSV	I-58	I-19	Towel
AV	Mizuho	Akitsushima	Chitose-class
Nagara-class	Kuu Ro Kuro's Nagara-class	Konishi's Nagara-class	Konishi's Nagara-class Kai Ni
Yuugumo-class Akigumo	Yuugumo-class	Akigumo	Yuugumo-class
Zara-class Libeccio	Zara	Pola	Libeccio
Others	Towel	Towel	Towel

Ship Girls' Umbrella Stand

The "Ship Girls' Umbrella Stand" (艦娘の傘立て) will have different versions depending on the secretary:

There are 3 Umbrella stands depending on the secretary type,
During the rainy season, ships with limited rainy season CG who have their umbrella (or other related item) in the stand will "take it" when set as secretary, removing it from the stand.
In the DE stand, Hirato's umbrella clips over Souyas's bag.

Secretary	List of Item Owners	Umbrella Stand
Secretary	List of Item Owners	Empty	Full
DE Souya Shimane Maru	Souya, Shimane Maru, Fukae, Etorofu, Hirato, Kaiboukan No.4, Kaiboukan No.22, Kaiboukan No.30
DD	Minazuki, Usugumo, Sagiri, Akebono, Sazanami, Yuudachi, Murasame, Takanami, Fujinami, Hayanami, Hamanami, Hayashimo, Kiyoshimo, Tamanami, Fuyutsuki, Libeccio, Scirocco, Heywood, Richard P.Leary
Others	Fusou, Haruna, Shouhou, Gambier Bay, Chitose, Chiyoda, Kako, Ooi, Yuubari, Ooyodo, I-203, Mizuho, Kamoi, Asahi, Tuscaloosa, Minneapolis, Gotland