Hmm,
Alien: Ruuko Kireinasora, check
Esper: Kotone Himekawa (if she can make a cameo from TH1 just like Multi and Serio did), check
Time Traveller: Yuki Kusakabe (if I'm not mistaken, she went on a time-jump to save Takaaki's life), check
Although, what does Harumi have to do with it since