Lucia?

[DemonSlayer6]

Maybbe she comes in the game as Chi.
Remember that Dante doesnt know her real name which is Chi and she appears disguised as that name and she also changes the way she looks, as in her hair and clothes... its possible!

 

[Ryujin]

TRISH IS A MUST HAVE IN DMC 4 NOT LUCIA TRISH CONROLLING LIGHTNG IS SO AWESOME

 

[Kool626]

luica might come in dmc4 becase she has dt

 

[Tony_Redgrave]

Well that's a great reason. Then all the monsters in DMC may return since in DMD they have DT.