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The Xenomorph seems to be a normal xenomorph warrior, but unlike other xenomorphs, it is holding a crowbar.
When Steve offers a Koopa Troopa a chocolate, saying the famous Forrest Gump line " Life was like a box of chocolates.", the xenomorph pops out of the box and roars in rage before attacking the Koopa Troopa, seemingly killing him, whilst Steve admires the Troopa's shoes.
A different one appears in SMG4: Mario Raids Area 51.
It can be presumed that this xenomorph is no different from the others, intending to kill anything that proves a threat. However instead of using its natural weapons, this xenomorph uses a crowbar. This could mean it might be smarter than other xenomorphs.