When Walker (the malicious maw) transformed into his more human form, he got a superior intelligence, and he found himself lonely. In one of his many adventures, he found a very very old prototype of a "combat matoran", made by the ancients. He gave him just a little armor, and they became like brothers, Walker being the older.
Stories aside, this moc was made with the pieces I didn't use for the malicious maw v2
He has a punching action, like K-2SO. (I can't show it, cuz I can't put here more than 3 photos XD)
He likes bad puns, like sans from undertale.
Nobody knows what would happen if someone tried to hurt his brother. The only person who knew it is not alive by now.
This moc is not supposed to be solid in a level of armor. he is supposed to be just a prototype, he is not supposed to be a normal robot.
Thank you all for your sweet comments!