Heybot!

Both have similar meta commentary within their genre and feature world-ending events that the characters need to come to terms with to solve. 

Hero Bank shares a similar sense of humor, but with more a straightforward story than Heybot has. They also share a writer. 

Both have MC's that pair with a hard-headed bot. Medarot has it's funny moments but the puns in Heybot! are a definite killer that are too clever for their own good. 

Both gdgd and heybot can be defined as being “shitpost shows”. They're most of the time very weird and make use of an unconventional artstyle, often grotesque or plain gross that can easily repel a big part of its audience. In this sense, they're really similar in being made primarily for the staff itself with lots of inside jokes and sometimes obscure references.  

Both excel saga and heybot have random and unexpected humor, they're essentially parodic in nature, sharing the same formula of having episodes focused on satirizing different genres of animation. Both series are self-aware and rely a lot on the use of meta-narratives and breaking of the 4th wall, heybot is especially creative in how it handles its merchandising inside the anime. Both of them are also impressively visually creative despite a severe lack of budget.