>>534131142
Their colors are Sonic & Amy swapped, and they remind me of another pair that's a orange/yellow boy with a taller green girl. Cosmo's guilt makes her have such incredibly low self-esteem that Tails has to be the one to lift her up, when Tails himself is known for low self-esteem as well in which Cosmo would lift him up. So their overall vibes just resonate on the same frequency, so they'd naturally gravitate towards each other.