She is Cecilia Immergreen from Hololive EN.

As you arrive at a huge Mansion your Grandfather had left for you it was very old but yet very majestic to be honest. But how is this old mansion still stand tall after all this year's been left not by maid and butler but your own grandpa and grandma. You enter the mansion and immediately got a suprise!

Cecilia : On your Knees Invader as I pointed the Sharp end of my spear or I wil- I stop as I see those familiar face Blood line of Holo...Master... Young master... Is that you?