Important soulmate aspects? :D
Both of you have rising signs opposite each other because then you have the that sign on 7th cusp thus balancing one another.
North and South node sextile or trine each other or conjunct or one of the nodes aspecting a personal planet especially sun, moon, Venus and Mars.
Having the same placements of sun and moon but in reverse.
Having moon aspecting Venus in a positive way ofc
Having sun aspecting Mars in a positive way
Having pluto conjunct or sextile or trine any personal planet but especially moon, Venus, sun and Mars.
Having both Pluto conjunct or both Mars conjunct or both.