Weakest DC comics character who can solo the "My Hero Academia" 'verse?

The title is self-explanatory.

Winning conditions: knockout, incapacitation or killing the opponent. No retreat.

Character's versions: mainstream continuity (New Earth/Post-Crisis + Prime Earth/Post-Flashpoint) for DC comics. Anime + manga for "My Hero Academia".

Round 1: No prep and no prior knowledge for a DC comics character about the MHA and its characters, same goes for MHA characters as well.

Round 2: Now DC character has a prior knowledge and prep about MHA characters.

Round 3: Both sides has a prep and prior knowledge about each others.