![1boy 1girl abyssal_admiral_(kantai_collection) fangs gloves highres horn kantai_collection kouba_nobu looking_at_viewer northern_ocean_hime sharp_teeth shinkaisei-kan sitting sitting_on_lap sitting_on_person teeth uniform white_hair rating:s score:10 post #2096982](/cdn_image/preview/9a/de/9ade40157bb03ac079d8379dd2df091c.jpg)
A serious-minded person is put into non-serious situations. (also includes characters that simply look serious)
Like the trope of the same name, these pictures present someone or something of incredible badass, coolness, or charisma, but all of that is made kind of funny by a cute or silly action or object. Despite this, they maintain a completely unamused look on their faces.
Don't get this confused with "Badass Adorable" where the character is drawn looking awesome in a cute form. However, they can possibly overlap.
Put it simply:
'Baby Batman' - Badass Adorable
'Batman & Baby' - The Comically Serious