Just your average Japanese Tentacle monster, loved by avid hentai readers.  I imagine him with sort of a raspy or hoarse voice like a monster or someone who smoaks.  Not too many lines this episode, but in the second episode he'll probably play a bigger role.  The first line is him very briefly appearing as he's running through the streets.  The second set of lines is when he assaults Deku under a bridge and starts "having his way" with him.  The third set of lines is when All Might comes into save Deku.   There's too many varying lines for me to tell you the direction for each, so take your best guess.