Lols...don't bother trying that in real life - it's disappointing. :/
But ya - Talim > Astaroth. Atleast against anyone I've seen use him. If you play with him a lot, you can pull out some mean combos, but generally Talim wins because her speed and juggles.
You know, all she has to do is headbutt that thing in the middle of his chest. I mean, isn't that his heart.... wait... (remembers how the characters can get back up from being impaled or evicerated)... never mind
To be fair, Vader is mostly metal, and his height isn't necessarily the same as it was before Episode III. Astaroth may have once been just a statue, but he's all flesh now.
Soul Calibur 2 was so satisfying for me since I mained with Talim and had many fights against Necrid Asteroth and the generic axe wielding enemy from the adventure mode.
SCII - 20-40$ Taking down a 7-foot enemy with a 5 foot character - Priceless