Haiyore! Nyaruko-san, Ore, Twintail ni Narimasu. Recommendations
Both have a girl with white hair that falls in love at first sight with the main character.
The main character from Ore, Twintails ni Narimasu looks similar with Cthuko from Haiyore! Nyaruko-san , when he is in his girl form.
Both anime have good comedy.
Both anime have aliens.
Both series are really funny, you should not watch these animes seriously because you need to be open to a lot of stupid comedy and references to different animes. I personally love these series because their full of humor and randomness!
A highschooler's normal life is forever changed when a sexy alien girl shows up and changes his life.
Both are ecchi comedies with harem elements that reference/parody tokusatsu shows. Nyaruko has more romcom elements while Twintails is more of an action show.