Bittersweet noun – Twining shrub of North America having yellow capsules enclosing scarlet seeds. Pink and bittersweet are semantically related. in color of blood topic. In some cases you can use "Pink" instead a noun "Bittersweet".
Code Geass ends with an interesting literal and metaphorical variation: Lelouch passes the Zero identity to Suzaku specifically so that he can become a hero by killing Lelouch per his plan to achieve world peace, using Lelouch's own goofy pink sword to do the deed, leading to a Bittersweet Ending.