SSSS.Gridman, Planet With Recommendations
Both are character focused action mecha series! Gridman has more slow, methodical character drama with big action scenes in the second half of each episode. Planet With has some character drama as well but, is more focused on it's themes and allowing the story to expand with psychic mecha battles throughout the series.
A Main Character with amnesia who has to pilot a mecha. Moreover, both features traits of parody and nonsense in favor of plot's development.