Busou Shinki

Similar wise for these two shows, it features an almost female cast, (one main male character,) that controls an aerial mechanic dogfight machine throughout the series. Some are lighthearted, some are serious moments, and most of it are action scenes. Busou Shinki, follows a group of female character, who are small size toys fighters, and addressed the male character as their master. IS follows a male character who is surrounded by an all female class in a school and uses an IS to fight. 

- male protagonists surrounded by girls ( IS = humans; BS = doll like 15 cm "shinki") - mecha suit thing - aerial fight scenes - harem ( i think? ) Both of them are fun to watch if you just want to relax and wait for something to happen 'cause who knows what will happen next? 

Practically the same thing, both are based on lines of very similar mecha musume action figures. 

this is your gate way to moe girls in robot suit it share a lot of think but Busou Shinki have Toy Story vibe. (and better CGI) and it one of the best Slice of Life Anime. if you want Slice of Life , Cute Girl in Mech suit 

the liltle servants that help the master do everything, just like the litthe Persocoms of chobits, practical and cute 

Both series have doll-jointed miniature girls with quirky personalities engaging in various antics appropriate for their stature to make for a cute, comic atmosphere. And in both anime, the girls are essentially paired up with (and live in the house) of a high school boy. The plots differ in thematic depth and style of presentation, but the characters are likable in similar ways.