diff --git a/src/command/ban.rs b/src/command/ban.rs
index 42e2dcf..8783e2b 100644
--- a/src/command/ban.rs
+++ b/src/command/ban.rs
@@ -1,14 +1,16 @@
 use super::{Command, Selector};
 
+#[derive(Default)]
 pub struct BanCommand {
-    target: Selector,
+    target: Option<Selector>,
     reason: Option<String>,
     ip: Option<bool>,
 }
 
 impl BanCommand {
-    pub fn new(target: Selector) -> Self {
-        Self { target, reason: None, ip: None }
+    pub fn target(mut self, target: Selector) -> Self {
+        self.target = Some(target);
+        self
     }
 
     pub fn reason(mut self, reason: impl Into<String>) -> Self {
@@ -22,7 +24,9 @@ impl BanCommand {
     }
 
     pub fn build(self) -> Command {
-        let target = self.target;
+        let target = self
+            .target
+            .unwrap_or(Selector::Player("nonexistent".to_string()));
         let ip = self.ip.unwrap_or(false);
         let mut s = if ip {
             format!("ban-ip {target}")
diff --git a/src/command/banlist.rs b/src/command/banlist.rs
index 3d746b0..8ceba79 100644
--- a/src/command/banlist.rs
+++ b/src/command/banlist.rs
@@ -1,6 +1,7 @@
 use super::Command;
 use std::marker::PhantomData;
 
+#[derive(Default)]
 pub struct BanlistCommand<State> {
     state: PhantomData<State>,
 }
diff --git a/src/command/defaultgamemode.rs b/src/command/defaultgamemode.rs
index 6d89d24..6d2183c 100644
--- a/src/command/defaultgamemode.rs
+++ b/src/command/defaultgamemode.rs
@@ -1,16 +1,18 @@
 use super::{Command, Gamemode};
 
+#[derive(Default)]
 pub struct DefaultGamemodeCommand {
-    gamemode: Gamemode,
+    gamemode: Option<Gamemode>,
 }
 
 impl DefaultGamemodeCommand {
-    pub fn new(gamemode: Gamemode) -> Self {
-        Self { gamemode }
+    pub fn gamemode(mut self, gamemode: Gamemode) -> Self {
+        self.gamemode = Some(gamemode);
+        self
     }
 
     pub fn build(self) -> Command {
-        let gamemode = self.gamemode;
+        let gamemode = self.gamemode.unwrap_or(Gamemode::Survival);
         let s = format!("defaultgamemode {gamemode}");
         Command(s)
     }
diff --git a/src/command/deop.rs b/src/command/deop.rs
index c30943e..05832dd 100644
--- a/src/command/deop.rs
+++ b/src/command/deop.rs
@@ -1,16 +1,18 @@
 use super::{Command, Selector};
 
+#[derive(Default)]
 pub struct DeopCommand {
-    target: Selector,
+    target: Option<Selector>,
 }
 
 impl DeopCommand {
-    pub fn new(target: Selector) -> Self {
-        Self { target }
+    pub fn target(mut self, target: Selector) -> Self {
+        self.target = Some(target);
+        self
     }
 
     pub fn build(self) -> Command {
-        let target = self.target;
+        let target = self.target.unwrap_or(Selector::Executor);
         let s = format!("deop {target}");
         Command(s)
     }
diff --git a/src/command/difficulty.rs b/src/command/difficulty.rs
index 2c70da5..4c01e6f 100644
--- a/src/command/difficulty.rs
+++ b/src/command/difficulty.rs
@@ -1,21 +1,18 @@
 use super::{Command, Difficulty};
 
+#[derive(Default)]
 pub struct DifficultyCommand {
     difficulty: Option<Difficulty>
 }
 
 impl DifficultyCommand {
-    pub fn new() -> Self {
-        Self { difficulty: None }
-    }
-
     pub fn difficulty(mut self, difficulty: Difficulty) -> Self {
         self.difficulty = Some(difficulty);
         self
     }
 
     pub fn build(self) -> Command {
-        let mut s = "difficulty".to_string();
+        let mut s = format!("difficulty");
         if let Some(difficulty) = self.difficulty {
             s.push_str(&format!(" {difficulty}"))
         };
diff --git a/src/command/gamemode.rs b/src/command/gamemode.rs
index 5a4e997..9a6b5d9 100644
--- a/src/command/gamemode.rs
+++ b/src/command/gamemode.rs
@@ -1,13 +1,15 @@
 use super::{Command, Gamemode, Selector};
 
+#[derive(Default)]
 pub struct GamemodeCommand {
-    gamemode: Gamemode,
+    gamemode: Option<Gamemode>,
     target: Option<Selector>
 }
 
 impl GamemodeCommand {
-    pub fn new(gamemode: Gamemode) -> Self {
-        Self { gamemode, target: None }
+    pub fn gamemode(mut self, gamemode: Gamemode) -> Self {
+        self.gamemode = Some(gamemode);
+        self
     }
 
     pub fn target(mut self, target: Selector) -> Self {
@@ -16,7 +18,7 @@ impl GamemodeCommand {
     }
 
     pub fn build(self) -> Command {
-        let gamemode = self.gamemode;
+        let gamemode = self.gamemode.unwrap_or(Gamemode::Survival);
         let mut s = format!("defaultgamemode {gamemode}");
         if let Some(target) = self.target {
             s.push_str(&format!(" {target}"))
diff --git a/src/command/kill.rs b/src/command/kill.rs
index 5e51a9b..d365fbb 100644
--- a/src/command/kill.rs
+++ b/src/command/kill.rs
@@ -1,16 +1,18 @@
 use super::{Command, Selector};
 
+#[derive(Default)]
 pub struct KillCommand {
-    target: Selector,
+    target: Option<Selector>,
 }
 
 impl KillCommand {
-    pub fn new(target: Selector) -> Self {
-        Self { target }
+    pub fn target(mut self, target: Selector) -> Self {
+        self.target = Some(target);
+        self
     }
 
     pub fn build(self) -> Command {
-        let target = self.target;
+        let target = self.target.unwrap_or(Selector::Executor);
         let s = format!("kill {target}");
         Command(s)
     }
diff --git a/src/command/list.rs b/src/command/list.rs
index ad7f7b9..398bdec 100644
--- a/src/command/list.rs
+++ b/src/command/list.rs
@@ -1,14 +1,11 @@
 use super::Command;
 
+#[derive(Default)]
 pub struct ListCommand {
     uuids: Option<bool>,
 }
 
 impl ListCommand {
-    pub fn new() -> Self {
-        Self { uuids: None }
-    }
-    
     pub fn uuids(mut self) -> Self {
         self.uuids = Some(true);
         self
diff --git a/src/command/mod.rs b/src/command/mod.rs
index ce1f188..4ab2054 100644
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@@ -82,43 +82,43 @@ impl Command {
         &self.0
     }
 
-    pub fn say(message: impl Into<String>) -> say::SayCommand {
-        say::SayCommand::new(message.into())
+    pub fn say() -> say::SayCommand {
+        say::SayCommand::default()
     }
 
     pub fn list() -> list::ListCommand {
-        list::ListCommand::new()
+        list::ListCommand::default()
     }
 
-    pub fn kill(target: Selector) -> kill::KillCommand {
-        kill::KillCommand::new(target)
+    pub fn kill() -> kill::KillCommand {
+        kill::KillCommand::default()
     }
 
-    pub fn ban(target: Selector) -> ban::BanCommand {
-        ban::BanCommand::new(target)
+    pub fn ban() -> ban::BanCommand {
+        ban::BanCommand::default()
     }
 
     pub fn banlist() -> banlist::BanlistCommand<banlist::NoFilter> {
         banlist::BanlistCommand::new()
     }
 
-    pub fn defaultgamemode(gamemode: Gamemode) -> defaultgamemode::DefaultGamemodeCommand {
-        defaultgamemode::DefaultGamemodeCommand::new(gamemode)
+    pub fn defaultgamemode() -> defaultgamemode::DefaultGamemodeCommand {
+        defaultgamemode::DefaultGamemodeCommand::default()
     }
 
-    pub fn op(target: Selector) -> op::OpCommand {
-        op::OpCommand::new(target)
+    pub fn op() -> op::OpCommand {
+        op::OpCommand::default()
     }
 
-    pub fn deop(target: Selector) -> deop::DeopCommand {
-        deop::DeopCommand::new(target)
+    pub fn deop() -> deop::DeopCommand {
+        deop::DeopCommand::default()
     }
 
     pub fn difficulty() -> difficulty::DifficultyCommand {
-        difficulty::DifficultyCommand::new()
+        difficulty::DifficultyCommand::default()
     }
 
-    pub fn gamemode(gamemode: Gamemode) -> gamemode::GamemodeCommand {
-        gamemode::GamemodeCommand::new(gamemode)
+    pub fn gamemode() -> gamemode::GamemodeCommand {
+        gamemode::GamemodeCommand::default()
     }
 }
\ No newline at end of file
diff --git a/src/command/op.rs b/src/command/op.rs
index 94bb8de..28e3cc2 100644
--- a/src/command/op.rs
+++ b/src/command/op.rs
@@ -1,16 +1,18 @@
 use super::{Command, Selector};
 
+#[derive(Default)]
 pub struct OpCommand {
-    target: Selector,
+    target: Option<Selector>,
 }
 
 impl OpCommand {
-    pub fn new(target: Selector) -> Self {
-        Self { target }
+    pub fn target(mut self, target: Selector) -> Self {
+        self.target = Some(target);
+        self
     }
 
     pub fn build(self) -> Command {
-        let target = self.target;
+        let target = self.target.unwrap_or(Selector::Executor);
         let s = format!("op {target}");
         Command(s)
     }
diff --git a/src/command/say.rs b/src/command/say.rs
index acf940d..44e5fe5 100644
--- a/src/command/say.rs
+++ b/src/command/say.rs
@@ -1,16 +1,18 @@
 use super::Command;
 
+#[derive(Default)]
 pub struct SayCommand {
-    message: String,
+    message: Option<String>,
 }
 
 impl SayCommand {
-    pub fn new(message: String) -> Self {
-        Self { message }
+    pub fn message(mut self, msg: impl Into<String>) -> Self {
+        self.message = Some(msg.into());
+        self
     }
 
     pub fn build(self) -> Command {
-        let message = self.message;
+        let message = self.message.unwrap_or("Hello, world!".to_string());
         let s = format!("say {message}");
         Command(s)
     }
diff --git a/src/lib.rs b/src/lib.rs
index 76ae7cc..2a184a5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,4 +2,4 @@ mod client;
 pub use client::{RconClient, RconError, RconResult};
 
 mod command;
-pub use command::{Command, Selector, Difficulty, Gamemode};
\ No newline at end of file
+pub use command::{Command, Selector};
\ No newline at end of file