Here are listed all Abyssals with seasonals.

Do note that for "summer CG", unlike normal ships, those are also separate abyssal forms with different stats and gears.
Some summer abyssals are also always weak against certain "Historical ships".
Outside of the Ne Kai, only bosses have seasonal CG.

Spring

Valentine

Northern Princess Valentine Day

Rainy

Northern Princess Rainy Season

Summer

Summer Mode

Holiday Mode

Vacation Mode

Fall

Halloween

Northern Princess II Halloween
Northern Princess III Halloween
Harbour Princess Halloween
Harbour Princess II Halloween
Isolated Island Princess Halloween

Saury Season

Northern Princess Saury Season

Winter

Christmas

Northern Princess Christmas

New Year

Northern Princess New Year 2016
Northern Princess New Year 2017
Northern Princess New Year 2017 Chuuha

Setsubun

Northern Princess Setsubun

Misc

Northern Princess Sukiya collaboration

Battleships (F/BB/V)	Battleship Ru-Class (B) (BB) · Battleship Ta-Class (FBB) · Battleship Re-Class (BBV) · Floating Fortress (BBV) · Escort Fortress (BBV)

Carriers (CV/L)	Light Carrier Nu-Class (Kai · B) (CVL) · Standard Carrier Wo-Class (Kai · Kai B) (CV)

Heavy Cruisers (CA/V)	Heavy Cruiser Ri-Class (Kai · B) (CA) · Heavy Cruiser Ne-Class (Kai · Kai Summer · Kai B Summer) (CA/V)

Light Cruisers (CL/T)	Light Cruiser Ho-Class · Light Cruiser He-Class (Kai) · Light Cruiser To-Class · Torpedo Cruiser Chi-Class (CLT) · Light Cruiser Tsu-Class

Destroyers (DD)	Destroyer I-Class (LM) · Destroyer Ro-Class (LM) · Destroyer Ha-Class (LM) · Destroyer Ni-Class (Kai) · Destroyer Na-Class (LM · Mass-Produced)

PT boats	PT Imp Pack · Schnellboot Imp Pack

Submarines (SS)	Submarine Ka-Class · Submarine Yo-Class · Submarine So-Class

Transports (AP)	Transport Ship Wa-Class (B)

Installations (Pillboxes)	Artillery Imp (BB) · Pillbox Imp (BB) · Anti-Air Guns Imp (CAV)

Boss

Battleships (F/BB)

Battleship Princess (Kai · Summer) · Battleship Water Demon (Kai) · Anchorage Water Demon Vacation Mode IV (BBV/BB) · Abyssal Pacific Princess · Batavia Princess (FBB) · New Southern Battleship Princess (FBB) · New Battleship Princess (FBB) · Lunga Point Heavy Cruiser Princess (FBB) · Mediterranean Dreadnought Water Princess (BB/BBV) · European Little Sister Princess

Aviation Battleships (BBV)

Anchorage Demon · Anchorage Princess · Armored Carrier Demon · Armored Carrier Princess · Southern Demon · Southern War Demon · Southern War Princess · Abyssal Twin Princesses · Northern Water Princess · French Battleship Princess (Vacation) · European Princess · Night Strait Princesses · Entombed Anti-Air Guardian Princess · Anchorage Water Demon Vacation Mode (BBV/BB) · European Water Princess · Mediterranean Dreadnought Water Princess Damaged (BB/BBV) · Abyssal Jade Princess (BBV/DD) · Entombed Anti-Air Guardian Winter Princess · Outer Southern Sea Destroyer Princess · Modernized Battleship Princess · Incomplete Battleship Princess · Abyssal Stranded Landing Princess · Standard Type Battleship Princess

Carriers (CV/B)

Aircraft Carrier Demon (Summer) · Aircraft Carrier Princess (Kai · B · Summer · Summer B) · Aircraft Carrier Water Demon · Abyssal Jellyfish Princess · Abyssal Crane Princess · South Pacific Aircraft Carrier Princess · European Armored Carrier Princess (CVB) · Prototype Carrier Princess Vacation Mode · New Mass-Produced Aircraft Carrier Princess · Abyssal Coral Sea Water Demon

Light Carriers (CVL)

Escort Princess · Escort Water Princess · German Escort Princess · Hi Convoy Princess · Yokohama Wharf Princess · Fast Light Carrier Water Demon · Remodeled Wartime Cargo Princess

Heavy Cruisers (CA/V)

Heavy Cruiser Princess (Summer) · Abyssal Heavy Cruiser Water Princess (CAV) · Atoll Aircraft Carrier Anchorage Princess (CAV)

Light Cruisers (CL)

Light Cruiser Demon · Light Cruiser Princess (B) · Abyssal Mediterranean Princess (Vacation) · Anti-Air Cruiser Princess · New Light Cruiser Princess · French Light Cruiser Princess

Destroyers (DD)

Destroyer Princess · Air Defense Princess · Destroyer Water Demon · Ancient Destroyer Demon · Ancient Destroyer Princess · Dock Princess · Abyssal Nimbus Princess · Anzio Princess · Abyssal Kuriles Princess · Destroyer Forest Princess · Abyssal Bamboo Princess · Abyssal Plum Princess · Abyssal Jade Princess Damaged (BBV/DD) · Abyssal Kushiro Cloud Princess · American Destroyer Princess (Mass-Produced)

Submarines (SS)

Submarine Princess (B · Summer) · New Submarine Princess (Vacation) · Gotou Islands Seabed Princess · Submarine Shark Water Demon · Abyssal I-go Water Princess

Seaplane Tenders (AV)

Seaplane Tender Princess · Seaplane Tender Water Princess · Abyssal Sun Princess

Installations

BB	Isolated Island Princess V (CV/BBV/BB) · Central Princess · Supply Depot Princess Damaged (Vacation (BBV/BB) · B Vacation (BBV/BB) · C (BBV/BB) · C Vacation (BBV/BB) · D (BBV/BB) · B Summer Landing (BBV/BB)) · Fortified Pillbox Princess

BBV	Airfield Princess (Patrol · Summer · Pacific) · Harbour Princess (Summer/B · Holiday) · Isolated Island Demon · Northern Princess · Midway Princess · Harbour Water Demon · Anchorage Water Demon · Supply Depot Princess (Summer · Vacation (BBV/BB) · B · B Vacation (BBV/BB) · C (BBV/BB) · C Vacation (BBV/BB) · D (BBV/BB) · E Vacation · B Summer Landing (BBV/BB)) · Isolated Island Princess IV (CV/BBV/BB) · Northernmost Landing Princess · Northern Little Sister · Super Heavy Bomber Airfield Princess

CV	Isolated Island Princess (CV/BBV/BB) · Lycoris Princess

Allied Vessels

v · e Seasonal

2013-2014	Christmas 2013 · Chocolate 2014 · White Day 2014 · Present Box 2014 · Christmas 2014 · End of Year 2014

2015	New Year 2015 · Setsubun 2015 · Valentine's Day 2015 · Hishimochi 2015 · White Day 2015 · 2nd Anniversary · Rainy Season 2015 · Early Summer 2015

2015 cont.	Mid Summer 2015 · Early Autumn 2015 · Mid Autumn 2015 · Saury 2015 · Halloween 2015 · Christmas 2015 · Christmas Eve 2015 · End of Year 2015

2016	New Year 2016 · Setsubun 2016 · Valentine's Day 2016 · Hinamatsuri 2016 · White Day 2016 · Coming of Spring 2016 · Third Anniversary · Rainy Season 2016

2016 cont.	Early Summer 2016 · Summer 2016 · Autumn 2016 · Nakau Collaboration · Saury 2016 · Autumn Wine 2016 · Christmas 2016 · End of Year 2016

2017	New Year 2017 · Winter 2017 · Setsubun 2017 · Valentine's Day 2017 · Hinamatsuri 2017 · White Day 2017 · Coming of Spring 2017 · 4th Anniversary · Rainy Season 2017

2017 cont.	Early Summer 2017 · Summer 2017 · Autumn 2017 · Saury 2017 · Late Autumn 2017 · Christmas 2017 · End of Year 2017

2018	New Year 2018 · Setsubun 2018 · Valentine's Day 2018 · White Day 2018 · Coming of Spring 2018 · 5th Anniversary · Rainy Season 2018

2018 cont.	Summer 2018 · Saury 2018 · Late Autumn 2018 · Christmas 2018

2019	New Year 2019 · Setsubun 2019 · Valentine's Day 2019 · Hinamatsuri 2019 · White Day 2019 · Coming of Spring 2019 · 6th Anniversary · Rainy Season 2019

2019 cont.	Summer 2019 · Autumn 2019 · Saury 2019 · Christmas 2019 · End of Year 2019

2020	New Year 2020 · Setsubun 2020 · Valentine's Day 2020 · Hinamatsuri 2020 · White Day 2020 · Coming of Spring 2020 · 7th Anniversary · Rainy Season 2020

2020 cont.	Summer 2020 · Autumn 2020 · Christmas 2020 · End of Year 2020

2021	New Year 2021 · Setsubun 2021 · Valentine's Day 2021 · Hinamatsuri 2021 · White Day 2021 · Coming of Spring 2021 · 8th Anniversary · Rainy Season 2021

2021 cont.	Summer 2021 · Autumn 2021 · Christmas 2021 · End of Year 2021

2022	New Year 2022 · Setsubun 2022 · Valentine's Day 2022 · White Day 2022 · Coming of Spring 2022 · 9th Anniversary · Rainy Season 2022

2022 cont.	Summer 2022 · Autumn 2022 · Christmas 2022 · End of Year 2022

2023	New Year 2023 · Setsubun 2023 · Valentine's Day 2023 · White Day 2023 · 10th Anniversary · Rainy Season 2023

2023 cont.	Summer 2023 · Autumn 2023 · Saury 2023 · Christmas 2023 · End of Year 2023

2024	New Year 2024 · Setsubun 2024 · Valentine's Day 2024 · White Day 2024 · Coming of Spring 2024 · 11th Anniversary · Rainy Season 2024

2024 cont.	Summer 2024

Misc	Final Battle · Abyssal

Enemy/Seasonal

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