So, Dameta is just one scrawny ball of insecurity and expressiveness, huh? What does that meant for his origin - for Meta-Knight? Is he the same way, deep down? What does he think of his reflection?
As a reflection, DMK mostly embodies MK's opposite traits. For example, he's loud and cocky, while MK is typically calm and level-headed—However, this doesn't mean MK won't occasionally fall prey to his own ego, or that DMK is incapable of being patient. Essentially, they're two opposing sides on the same shared spectrum.
They do have similar insecurities at their core, but they manifest in different ways. If MK feels irritated about his height, he'll start walking on his tip-toes to appear taller. If it's DMK, then he'll claim that actually, he is tall, and deny any further argument. MK takes great pains to keep his face hidden behind his mask for comfort, and avoids any questions about it. DMK purposely takes it off without prompting, just to show everyone how he definitely totally isn't bothered by it at all.
Generally, MK wouldn't get along with his reflection. DMK's values differ way too much from his own, and he wouldn't trust him (not to mention how rarely MK opens up to begin with). DMK doesn't much like MK either, though that goes beyond just the personality differences, and veers more into how reflections tend to be prickly about their own existence being tied to their counterpart in the first place.
Aha, thank you for the ask!