diff --git a/blackboard/bb_param/bb_variant.h b/blackboard/bb_param/bb_variant.h
index d8664bd..1eb95bc 100644
--- a/blackboard/bb_param/bb_variant.h
+++ b/blackboard/bb_param/bb_variant.h
@@ -25,10 +25,10 @@ private:
 protected:
 	static void _bind_methods();
 
+public:
 	virtual Variant::Type get_type() const override;
 	void set_type(Variant::Type p_type);
 
-public:
 	BBVariant();
 };
 
diff --git a/editor/editor_property_bb_param.cpp b/editor/editor_property_bb_param.cpp
index 75898fc..5cf8064 100644
--- a/editor/editor_property_bb_param.cpp
+++ b/editor/editor_property_bb_param.cpp
@@ -11,11 +11,14 @@
 
 #include "editor_property_bb_param.h"
 
+#include "core/variant/variant.h"
 #include "modules/limboai/blackboard/bb_param/bb_param.h"
+#include "modules/limboai/blackboard/bb_param/bb_variant.h"
 #include "modules/limboai/editor/mode_switch_button.h"
 
 #include "core/error/error_macros.h"
 #include "core/object/class_db.h"
+#include "core/object/ref_counted.h"
 #include "core/os/memory.h"
 #include "core/string/print_string.h"
 #include "editor/editor_inspector.h"
@@ -27,6 +30,7 @@
 #include "scene/gui/box_container.h"
 #include "scene/gui/button.h"
 #include "scene/gui/line_edit.h"
+#include "scene/gui/menu_button.h"
 
 Ref<BBParam> EditorPropertyBBParam::_get_edited_param() {
 	Ref<BBParam> param = get_edited_property_value();
@@ -47,6 +51,9 @@ void EditorPropertyBBParam::_create_value_editor(Variant::Type p_type) {
 	}
 
 	switch (p_type) {
+		case Variant::NIL: {
+			value_editor = memnew(EditorPropertyNil);
+		} break;
 		case Variant::BOOL: {
 			value_editor = memnew(EditorPropertyCheck);
 		} break;
@@ -186,7 +193,7 @@ void EditorPropertyBBParam::_create_value_editor(Variant::Type p_type) {
 		}
 	}
 	value_editor->set_name_split_ratio(0.0);
-	hbox->add_child(value_editor);
+	editor_hbox->add_child(value_editor);
 	value_editor->set_h_size_flags(SIZE_EXPAND_FILL);
 	value_editor->set_meta(SNAME("_param_type"), p_type);
 	value_editor->connect(SNAME("property_changed"), callable_mp(this, &EditorPropertyBBParam::_value_edited));
@@ -194,7 +201,7 @@ void EditorPropertyBBParam::_create_value_editor(Variant::Type p_type) {
 
 void EditorPropertyBBParam::_remove_value_editor() {
 	if (value_editor) {
-		hbox->remove_child(value_editor);
+		editor_hbox->remove_child(value_editor);
 		value_editor->queue_free();
 		value_editor = nullptr;
 	}
@@ -209,6 +216,16 @@ void EditorPropertyBBParam::_mode_changed() {
 	update_property();
 }
 
+void EditorPropertyBBParam::_type_selected(int p_index) {
+	Ref<BBVariant> param = _get_edited_param();
+	ERR_FAIL_COND(param.is_null());
+	Variant::Type t = Variant::Type(p_index);
+	param->set_type(t);
+	String type_name = Variant::get_type_name(t);
+	type_choice->set_icon(get_editor_theme_icon(type_name));
+	update_property();
+}
+
 void EditorPropertyBBParam::_variable_edited(const String &p_text) {
 	_get_edited_param()->set_variable(p_text);
 }
@@ -240,12 +257,32 @@ void EditorPropertyBBParam::_notification(int p_what) {
 	switch (p_what) {
 		case NOTIFICATION_ENTER_TREE:
 		case NOTIFICATION_THEME_CHANGED: {
-			int id = mode_button->get_mode();
+			{
+				String type = Variant::get_type_name(_get_edited_param()->get_type());
+				type_choice->set_icon(get_editor_theme_icon(type));
+			}
+
+			// Initialize mode button.
 			mode_button->clear();
 			mode_button->add_mode(Mode::SPECIFY_VALUE, get_editor_theme_icon(SNAME("LimboSpecifyValue")), TTR("Mode: Specify value.\nClick to switch mode."));
 			mode_button->add_mode(Mode::BIND_VAR, get_editor_theme_icon(SNAME("BTSetVar")), TTR("Mode: Bind blackboard variable.\nClick to switch mode."));
-			if (id >= 0) {
-				mode_button->set_mode(id);
+			mode_button->set_mode(_get_edited_param()->get_value_source() == BBParam::BLACKBOARD_VAR ? Mode::BIND_VAR : Mode::SPECIFY_VALUE);
+
+			Ref<BBVariant> variant_param = _get_edited_param();
+			bool is_variant_param = variant_param.is_valid();
+			if (is_variant_param) {
+				// Initialize type choice.
+				PopupMenu *type_menu = type_choice->get_popup();
+				type_menu->clear();
+				for (int i = 0; i < Variant::VARIANT_MAX; i++) {
+					if (i == Variant::RID || i == Variant::CALLABLE || i == Variant::OBJECT || i == Variant::SIGNAL) {
+						continue;
+					}
+					String type = Variant::get_type_name(Variant::Type(i));
+					type_menu->add_icon_item(get_editor_theme_icon(type), type, i);
+				}
+			} else { // Not a variant param.
+				type_choice->hide();
 			}
 		} break;
 	}
@@ -261,12 +298,21 @@ EditorPropertyBBParam::EditorPropertyBBParam() {
 	mode_button->set_focus_mode(FOCUS_NONE);
 	mode_button->connect(SNAME("mode_changed"), callable_mp(this, &EditorPropertyBBParam::_mode_changed));
 
+	editor_hbox = memnew(HBoxContainer);
+	hbox->add_child(editor_hbox);
+	editor_hbox->set_h_size_flags(SIZE_EXPAND_FILL);
+	editor_hbox->add_theme_constant_override(SNAME("separation"), 0);
+
 	variable_edit = memnew(LineEdit);
-	hbox->add_child(variable_edit);
+	editor_hbox->add_child(variable_edit);
 	variable_edit->set_placeholder(TTR("Variable"));
 	variable_edit->set_h_size_flags(SIZE_EXPAND_FILL);
 	variable_edit->connect(SNAME("text_changed"), callable_mp(this, &EditorPropertyBBParam::_variable_edited));
 
+	type_choice = memnew(MenuButton);
+	hbox->add_child(type_choice);
+	type_choice->get_popup()->connect(SNAME("id_pressed"), callable_mp(this, &EditorPropertyBBParam::_type_selected));
+
 	param_type = SNAME("BBString");
 }
 
diff --git a/editor/editor_property_bb_param.h b/editor/editor_property_bb_param.h
index 85c2e86..e1c2d40 100644
--- a/editor/editor_property_bb_param.h
+++ b/editor/editor_property_bb_param.h
@@ -12,12 +12,14 @@
 #ifndef EDITOR_PROPERTY_BB_PARAM_H
 #define EDITOR_PROPERTY_BB_PARAM_H
 
-#include "core/object/object.h"
 #include "editor/editor_inspector.h"
 
 #include "modules/limboai/blackboard/bb_param/bb_param.h"
 #include "modules/limboai/editor/mode_switch_button.h"
 
+#include "scene/gui/box_container.h"
+#include "scene/gui/menu_button.h"
+
 class EditorPropertyBBParam : public EditorProperty {
 	GDCLASS(EditorPropertyBBParam, EditorProperty);
 
@@ -32,9 +34,11 @@ private:
 	Mode mode = Mode::SPECIFY_VALUE;
 
 	HBoxContainer *hbox = nullptr;
+	HBoxContainer *editor_hbox = nullptr;
 	ModeSwitchButton *mode_button = nullptr;
 	EditorProperty *value_editor = nullptr;
 	LineEdit *variable_edit = nullptr;
+	MenuButton *type_choice = nullptr;
 
 	Ref<BBParam> _get_edited_param();
 
@@ -44,6 +48,7 @@ private:
 	void _value_edited(const String &p_property, Variant p_value, const String &p_name = "", bool p_changing = false);
 	void _variable_edited(const String &p_text);
 	void _mode_changed();
+	void _type_selected(int p_index);
 
 protected:
 	void _notification(int p_what);
diff --git a/editor/mode_switch_button.cpp b/editor/mode_switch_button.cpp
index e0051c5..b50fa6e 100644
--- a/editor/mode_switch_button.cpp
+++ b/editor/mode_switch_button.cpp
@@ -32,7 +32,7 @@ void ModeSwitchButton::add_mode(int p_id, const Ref<Texture2D> &p_icon, const St
 	modes.append(mode);
 
 	if (current_mode_index == -1) {
-		_set_mode(0);
+		_set_mode_by_index(0);
 	}
 }
 
@@ -48,7 +48,7 @@ void ModeSwitchButton::set_mode(int p_id, bool p_no_signal) {
 	}
 	ERR_FAIL_COND_MSG(idx == -1, "Button state not found with such id: " + itos(p_id));
 
-	_set_mode(p_id);
+	_set_mode_by_index(idx);
 	if (!p_no_signal) {
 		emit_signal(SNAME("mode_changed"));
 	}
diff --git a/editor/mode_switch_button.h b/editor/mode_switch_button.h
index e4830b4..b27e92e 100644
--- a/editor/mode_switch_button.h
+++ b/editor/mode_switch_button.h
@@ -30,8 +30,8 @@ private:
 
 	Vector<Mode> modes;
 
-	_FORCE_INLINE_ void _set_mode(int p_id) {
-		current_mode_index = p_id;
+	_FORCE_INLINE_ void _set_mode_by_index(int p_index) {
+		current_mode_index = p_index;
 		set_icon(modes[current_mode_index].icon);
 		if (!modes[current_mode_index].tooltip.is_empty()) {
 			set_tooltip_text(modes[current_mode_index].tooltip);