diff --git a/clean_files.txt b/clean_files.txt
index 2b8c661fb3..ce1a54d21f 100644
--- a/clean_files.txt
+++ b/clean_files.txt
@@ -50,6 +50,9 @@ themes/brainy
 themes/brunton
 themes/candy
 themes/clean
+themes/codeword
+themes/cooperkid
+themes/cupcake
 themes/doubletime
 themes/doubletime_multiline
 themes/doubletime_multiline_pyonly
diff --git a/themes/codeword/codeword.theme.bash b/themes/codeword/codeword.theme.bash
index 0966d6212d..9237ebd7df 100644
--- a/themes/codeword/codeword.theme.bash
+++ b/themes/codeword/codeword.theme.bash
@@ -1,4 +1,5 @@
 # shellcheck shell=bash
+# shellcheck disable=SC2034 # Expected behavior for themes.
 
 SCM_THEME_PROMPT_PREFIX="${SCM_THEME_PROMPT_SUFFIX:-}"
 SCM_THEME_PROMPT_DIRTY="${bold_red?} ✗${normal?}"
diff --git a/themes/cooperkid/cooperkid.theme.bash b/themes/cooperkid/cooperkid.theme.bash
index 1b9c9c1163..b0ea4b385b 100644
--- a/themes/cooperkid/cooperkid.theme.bash
+++ b/themes/cooperkid/cooperkid.theme.bash
@@ -1,16 +1,18 @@
+# shellcheck shell=bash
+# shellcheck disable=SC2034 # Expected behavior for themes.
 # ------------------------------------------------------------------#
 #          FILE: cooperkid.zsh-theme                                #
 #            BY: Alfredo Bejarano                                   #
 #      BASED ON: Mr Briggs by Matt Brigg (matt@mattbriggs.net)      #
 # ------------------------------------------------------------------#
 
-SCM_THEME_PROMPT_DIRTY="${red} ✗${reset_color}"
-SCM_THEME_PROMPT_AHEAD="${yellow} ↑${reset_color}"
-SCM_THEME_PROMPT_CLEAN="${green} ✓${reset_color}"
+SCM_THEME_PROMPT_DIRTY="${red?} ✗${reset_color?}"
+SCM_THEME_PROMPT_AHEAD="${yellow?} ↑${reset_color?}"
+SCM_THEME_PROMPT_CLEAN="${green?} ✓${reset_color?}"
 SCM_THEME_PROMPT_PREFIX=" "
 SCM_THEME_PROMPT_SUFFIX=""
-GIT_SHA_PREFIX="${blue}"
-GIT_SHA_SUFFIX="${reset_color}"
+GIT_SHA_PREFIX="${blue?}"
+GIT_SHA_SUFFIX="${reset_color?}"
 
 function rvm_version_prompt {
 	if which rvm &> /dev/null; then
@@ -27,11 +29,13 @@ function git_short_sha() {
 
 function prompt() {
 	local return_status=""
-	local ruby="${red}$(ruby_version_prompt)${reset_color}"
-	local user_host="${green}\h @ \w${reset_color}"
-	local git_branch="$(git_short_sha)${cyan}$(scm_prompt_info)${reset_color}"
+	local ruby
+	ruby="${red?}$(ruby_version_prompt)${reset_color?}"
+	local user_host="${green?}\h @ \w${reset_color?}"
+	local git_branch
+	git_branch="$(git_short_sha)${cyan?}$(scm_prompt_info)${reset_color?}"
 	local prompt_symbol=' '
-	local prompt_char="${purple}>_${reset_color} "
+	local prompt_char="${purple?}>_${reset_color?} "
 
 	PS1="\n${user_host}${prompt_symbol}${ruby} ${git_branch} ${return_status}\n${prompt_char}"
 }
diff --git a/themes/cupcake/cupcake.theme.bash b/themes/cupcake/cupcake.theme.bash
index 7a5971f2de..5956bc465a 100644
--- a/themes/cupcake/cupcake.theme.bash
+++ b/themes/cupcake/cupcake.theme.bash
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 # shellcheck disable=SC2034 # Expected behavior for themes.
 
 # Emoji-based theme to display source control management and
@@ -20,11 +20,11 @@ VIRTUALENV_THEME_PROMPT_SUFFIX=""
 # SCM prompts
 SCM_NONE_CHAR=""
 SCM_GIT_CHAR="[±] "
-SCM_GIT_BEHIND_CHAR="${red}↓${normal}"
-SCM_GIT_AHEAD_CHAR="${bold_green}↑${normal}"
+SCM_GIT_BEHIND_CHAR="${red?}↓${normal?}"
+SCM_GIT_AHEAD_CHAR="${bold_green?}↑${normal?}"
 SCM_GIT_UNTRACKED_CHAR="⌀"
-SCM_GIT_UNSTAGED_CHAR="${bold_yellow}•${normal}"
-SCM_GIT_STAGED_CHAR="${bold_green}+${normal}"
+SCM_GIT_UNSTAGED_CHAR="${bold_yellow?}•${normal?}"
+SCM_GIT_STAGED_CHAR="${bold_green?}+${normal?}"
 
 SCM_THEME_PROMPT_DIRTY=""
 SCM_THEME_PROMPT_CLEAN=""
@@ -32,8 +32,8 @@ SCM_THEME_PROMPT_PREFIX=""
 SCM_THEME_PROMPT_SUFFIX=""
 
 # Git status prompts
-GIT_THEME_PROMPT_DIRTY=" ${red}✗${normal}"
-GIT_THEME_PROMPT_CLEAN=" ${bold_green}✓${normal}"
+GIT_THEME_PROMPT_DIRTY=" ${red?}✗${normal?}"
+GIT_THEME_PROMPT_CLEAN=" ${bold_green?}✓${normal?}"
 GIT_THEME_PROMPT_PREFIX=""
 GIT_THEME_PROMPT_SUFFIX=""
 
@@ -60,19 +60,19 @@ function virtualenv_prompt {
 
 # Rename tab
 function tabname {
-	printf "\e]1;$1\a"
+	printf "\e]1;%s\a" "$1"
 }
 
 # Rename window
 function winname {
-	printf "\e]2;$1\a"
+	printf "\e]2;%s\a" "$1"
 }
 
 # PROMPT OUTPUT ===============================================================
 
 # Displays the current prompt
 function prompt_command() {
-	PS1="\n${icon_start}$(virtualenv_prompt)${icon_user}${bold_red}\u${normal}${icon_host}${bold_cyan}\h${normal}${icon_directory}${bold_purple}\W${normal}\$([[ -n \$(git branch 2> /dev/null) ]] && echo \" on ${icon_branch}  \")${white}$(scm_prompt_info)${normal}\n${icon_end}"
+	PS1="\n${icon_start}$(virtualenv_prompt)${icon_user}${bold_red?}\u${normal?}${icon_host}${bold_cyan?}\h${normal?}${icon_directory}${bold_purple?}\W${normal?}\$([[ -n \$(git branch 2> /dev/null) ]] && echo \" on ${icon_branch}  \")${white?}$(scm_prompt_info)${normal?}\n${icon_end}"
 	PS2="${icon_end}"
 }