I posted earlier about a character idea. A character weak and fast, that can transform himself in a powered up version of himself. A vampire could fit in this idea, giving him a command grab that fills a “blood meter”. Once full, the vampire transforms into his true form.
His weaker form could be a “victorian” vampire, and his powered up version a “nosferatu” vampire(a huge one).
This is the original thread if you want to share your thoughts