I didn't even realise that. Now you've pointed it out, I should've guessed it from Tessy's design. But yeah, like you say, Taki really does have a different look to him.
I've been a big fan of Tanaka's character designs for a while now; I like the 'rounded' tips on the end of his characters' hair; it's uniquely him. His designs for each character in a single show are also very diverse — a far cry from something like Fireworks, where all the characters have basically the same face but with different hairstyles.
Looking again at Tanaka's CV, I keep forgetting he also did the designs for High School of the Dead. Not that I've seen that or anything. 😜