I have no problem recognizing Aegis, T-elos, Suou and Charlotte. I don't recognize the maid and pale guy and I forgot what the robot's name is.

Metabee is the name of the robot

I'm actually wondering why he chose these characters to put together in this pic

Regniroth said:
I'm actually wondering why he chose these characters to put together in this pic

This image is related to "やる夫はスカヴェンジャーのようです" (Yaruo Seems to be a "Scavenger"), a series of Yaruo-threads on 2ch.
'やる夫スレ' (Yaruo-thread) is a type of ascii art thread / topic starring Yaruo.

In this series, he explores the ruins of the post-apocalyptic Ehime and salvages usable (or useless) things.

• Author's wiki

• Datalog of the threads