On a good day metal sonic in the games tends to be kind of a silent smartass cheeky bastard who knows he's able to go faster than sonic and eats fucking pavement by the end, which after a few sessions leads to bad days where he starts overcompensating and power scale boosting to beat sonic and monologuing about how he's "the real sonic" when he himself knows that's bullshit and he's never gonna be the real sonic. He's more of sonic's shadow than the character literally named shadow. I don't like how YT vidya people now frame metal sonic as some scary unfeeling murder drone thing with no personality when describing sonic lore and poo poo away his dialogue from the post 3d era as "oh he got reprogrammed out of that after that game and that was just experimental upgrades!"
I just keep thinking sometimes about how the anime movie back in the day that also didn't follow actual sonic lore but got the characterization down perfect in a time where there was much less writing to pull from literally had metal slap sonic's hand away and let himself burn to death and melt in the magma while uttering his only line in the movie that isn't just goofy little bleepy bloop sounds everyone somehow understood. "there is only one sonic"
Can't find the clip by itself anymore but I can find the full final fight. I think they were really able to capture it in this movie made only a few years after his debut as a character and I wish we got more shit like this in terms of Metal sonic where they clearly understand or conveniently happen to coincidentally capture his deal.
There's some extraneous shit in this about how sonic and metal being partially linked being able to feel shit the other one does due to some tech fuckery but it's basically used for a gag where metal sees up someone's skirt and sonic starts reacting to it or a brief bit with tails overloading the link to stun metal.
Tl;Dr the little finger wag, hologam of him kicking an animal, and other simplistic animations from CD already speak volumes about metal sonic as a character, the OVA and heroes built on that, and YT video essayists fucking ignore it because he's a robot which will lead to sega possibly ignoring it