Games like Paper War
Paper War. These games share the most with it, and each one says why.

Legend of Slime: Idle RPGUpdated
Also idle, rpg, auto battler
Lead a clan of slimes through automatic battles, evolving heroes and gathering loot even while offline.
75% idle
Auto Battles Online: Idle RPGUpdated
Also idle, auto battler, rpg
Gear a team of heroes from thousands of items, place them on the field, and let them fight other players' teams automatically.

Idle Horizons: Dawn of HeroesUpdated
Also auto battler, rpg, idle
Draft heroes, tune deep skill trees and positioning, and run dungeons and raids in an auto-battler built for theorycrafters.

Dunidle: Auto Battler RPG GameDormant
Also idle, auto battler, rpg
Lead an 8-bit hero party through dungeons and bosses, gearing them up while they battle on their own.

壶中日月 Timeless Teapot
Also rpg, auto battler, idle
Lead a cultivation sect inside a magic teapot, recruiting disciples who train, fight and break through realms automatically while you tune gear and formations.
77% steam
Bard Idle
Also auto battler, rpg, idle
Assemble a party of heroes with randomized race, class and weapon, then back them with ballads you compose and jelly dwarfs across arena and titan modes.
69% steam50% idle
Legends of Dragaea: Idle DungeonsUpdated
Also rpg, auto battler
A first-person idle dungeon crawler where parties from nine races explore dungeons, take on 9-hero raids and grow your own guild and town.
86% steam
Idle Hero TD - Tower Defense RPGUpdated
Also rpg, auto battler
An endless tower defense where you recruit and place fantasy heroes against infinite waves, and they keep fighting and collecting rewards while the game is closed.
82% steam75% idle
Loot LoopUpdated
Also rpg, auto battler
Send a party of tiny heroes into dungeon runs that last seconds, then spend the loot on a large skill tree between attempts.
92% steam
SkelesellerUpdated
Also rpg, auto battler
A dead adventurer returns as a skeleton shopkeeper who hires heroes, sends them into battle and sells their loot to grow the town. Finite, with small numbers and no prestige.
91% steamhas ending
AFK ArenaUpdated
Also rpg, idle
A hero-collecting idle RPG with a campaign, a beast system and co-op modes.

Summoners Greed: AFK TD TowerUpdated
Also auto battler, rpg
Summon heroes, place them on a grid to hold off waves, and collect rewards that build up while the game is closed.
75% idle
Alien Invasion: RPG Idle SpaceUpdated
Also rpg, idle
Guide an alien that eats humans to grow stronger, evolve its abilities and beat bosses in new locations.

Invincible: Guarding the GlobeUpdated
Also rpg, idle
Recruit characters from Invincible, merge clones to rank them up, and run idle battles in the background.
75% idle
Mythic Heroes: Idle RPGUpdated
Also idle, rpg
Summon gods and heroes from many mythologies into a party that battles on its own or under your direction.

Ulala: Idle AdventureUpdated
Also idle, rpg
Join a social Stone Age MMORPG where your character and pets level up automatically while you team up with friends.

Sword x StaffUpdated
Also idle, rpg
Explore a large isekai world with two companions, mixing over 200 skills while idle systems gather resources.

Street Fighter Duel - Idle RPGUpdated
Also idle, rpg
Recruit famous Street Fighter characters into a team that keeps getting stronger while you are away.

Epic Stickman: RPG Idle WarUpdated
Also idle, rpg
Guide a stickman hero through a shadowy realm, picking a class and gaining power in automatic fights even offline.
75% idle
PewDiePie's Pixelings Idle RPGUpdated
Also idle, rpg
Collect pixel creatures alongside PewDiePie and arrange them in fights that blend idle play with turn-based tactics.

Crush Them All - Idle RPGUpdated
Also idle, rpg
Collect heroes and crush bosses across more than 1000 stages, ascending to new worlds and progressing while away.
75% idle
Idle Slayer: Addictive ClickerUpdated
Also idle, rpg
Slay monsters and bosses across many worlds for coins, with a big skill tree, ascensions and offline progress.

Immortal Taoists-MUD WuxiaUpdated
Also idle, rpg
Seek immortality as a cultivator in a playable xianxia novel, joining sects, learning arts and raising spirit beasts.

Battle Simulator: Idle WarfareUpdated
Also auto battler, idle
Recruit fighters from many eras, from Spartans to helicopters, and watch them clash in automatic battles.