1. Kennen's Past and Present
Released in 2010, initially rated OP due to strong laning and teamfight contribution
Change in the 2012 season with reduced auto-attack range
Weakened poke in the 2013 season due to Warmog's meta, re-evaluated against Renekton/Elise
Weakened in the 2014 pre-season due to changes in Doran's Blade/Shield
Rose to prominence in the 2015 season with reduced ultimate damage interval, emerged as a Darius counter
Utilizing Hextech Belt, AP scaling nerf and adoption of Fervor of Battle
Utilizing Unsealed Spellbook, Summon Aery, Kleptomancy runes
Lack of Mythic item due to Belt nerf in the 2021 season, nerfed due to tournament picks
Re-examined in the 2024 season with ultimate cast time deletion buff, returned to Tier 1-2
Currently reduced pick rate due to decreased base health and Q skill nerf
2. Caitlyn's Past and Present
Released in 2011, minimal activity in the golden age of ADCs in the 2011-12 season
Strong laning in the 2013 season with lane swap meta, utilizing turret headshots
Counter to Twitch/Vayne due to Blade of the Ruined King rise in the 2014 season, pushed out by tank meta
Rose to prominence in the 2016 season with W/E skill combo headshot rework, strengthened laning pressure
AP scaling deleted, improved with trap-headshot damage/cooldown buff
Rose to prominence as a crit-based damage dealer in the 2017 season with Blade of the Ruined King nerf, fell with Runaan's nerf
Ranked Tier 1 with basic attack power/movement speed buff in patch 10.1, then plummeted with nerfs
Dark Ages due to lack of Mythic item in the 2021 season, tank meta
Q scaling increase buff in patch 11.15
Rose to prominence in the 2022 season with Arcane modeling change, headshot speed buff, utilizing Lethal Tempo
Fell with Galeforce nerf, attempted to be used as support, treated as a minion due to attack power nerf
Currently Tier 4
3. Kayn's Past and Present
Released in the 2017 season, simple skill set, preferred Darkin over Shadow Assassin
Evaluation declined due to lack of early impact/ganking power
Increased transformation gauge acquisition in the 2018 season, Q/W combo buff, improved early ganking
Rose to prominence with Conqueror rune and Darkin synergy
Early weakness highlighted due to jungle experience reduction in the 2020 season, Shadow Assassin rose with assassin items
Ranked as a Tier 1-2 jungler with 12 buffs until patch 10.9
Darkin's teamfight power increased with the appearance of items in the 2021 season, surge in win rate/ban rate
Became a trash champion with basic defense/Q damage nerf, Darkin re-emerged with Sunfire Aegis nerf
Evaluated for low-tier smurfing with Conqueror/Goredrinker nerf
Shadow Assassin rose to prominence with First Strike bug play, later fixed
Darkin rose to prominence with durability patch, appearance of Jak'Sho the Protean
Shadow Assassin/Darkin buff after Mythic item deletion
Currently highlighting the importance of early game with Bounty Hunter rune, Tier 4
4. Kayle's Past and Present
Released in 2009, ally-dependent skill set
Q slow, W heal/movement speed, E range increase/AoE damage, ultimate invincibility in the 2012 season
Mid Kayle rose to prominence in the 2013 season with the Age of Atma's, researching tank-killing item builds
Q damage reduction, W/ultimate cast range reduction nerf
Ranked OP in the 2014 season with Feral Flare, Devourer rune, utilizing AoE damage/healing
Conqueror rune rose to prominence in the 2018 season, E cooldown increase nerf
Level 11 ranged, level 16 true damage effect after rework
Abuse of Elixir of Skill bug with Kleptomancy rune, later fixed
Changed level 6/11/16 enhancement effects in patch 9.17
Attempted to utilize Ravenous Hydra in the 2021 season, limited by Mythic items
Rose to prominence with Riftmaker, buff runes, durability patch in the 2022 season, appeared in tournaments
Underperforming due to lane importance meta, ultimate use allows auto-attacks buff
Currently Tier 3
5. Kog'Maw's Past and Present
Released in 2010, minimal skill set changes, rolled back after rework
Late-game carry power in the 2012 season, AP Kog'Maw research, fell with the nerf bat
Kog'Maw carry meta prevalent in tournaments with ADC item revamp, Blade of the Ruined King buff
W skill change (2x attack speed) in 5.2 ranged dealer patch, Helper controversy, rolled back
W rollback in patch 6.18, underperforming as a hyper-carry immobile ADC
Trending with Ardent Censer rise in the 2017 season, full damage Kog'Maw popular, appeared in tournaments
Popular as an Ezreal counter with Fleet Footwork rune after Censer nerf
Attempted AP build, spear meta, underperforming Mythic item meta
W health-proportional damage buff, Machete-tank item build, full damage Kog'Maw re-examined
AP Kog'Maw ranked OP with AP item rise in the 2024 season, Blade of the Ruined King buff
Currently Tier 2-3 with attack speed cap patch, synergy with Lulu