AC is processed by character, not player, so so you are free to double up on who you're threading with across multiple characters.
To answer your specific example, it would be fine for Sonic to make AC with Luigi and for Peach to make AC with Mario after the opposite had happened in the prior month.
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AC is processed by character, not player, so so you are free to double up on who you're threading with across multiple characters.
To answer your specific example, it would be fine for Sonic to make AC with Luigi and for Peach to make AC with Mario after the opposite had happened in the prior month.