Because Enneagram is less complex than socionics, I had an idea today, which shows that some of the socionics types are described in such a way that they work better as combos of different Enneagram types than the types on their own.
So you have your obvious links:
ESE - 2
ILE - 7
IEI - 4
ILI - 5
But then I've thought about it and drawn some more conclusions.
SEI - Seven and Nine (but primarily Nine IMO). Nine is obvious, but they often have the well-being of a Seven.
LII - a strange combo of Five and Nine, with a hint of One and perhaps Six (but what type doesn't have a hint of Six in it). I've seen some Nine LIIs, which I was surprised about, but then it does make sense. Through lack of Se, they ruminate. They narcotise. They procrastinate etc. LIIs have the intellect of a Five, or a 6w5, but then at the same time, given that they are IJ, this can make them seem Oneish (for example, look at LII Kant, who was the most regimented man ever).
EIE - mainly Three, but with hints of One (striving to be good and make a change, probably due to their being NF) and Six. They are too doubting of themselves to be completely Three-like, which is what Six accounts for.
LSI - a combination of One and Eight, with a hint of Six (more accurately 6w5). They have the drive of the Eight, the perfection of the One, and the rigidity of a routine-focused Six. At the same time, they lack the outwardly forceful nature of the Eight, and often the doubts and worries of the Six simply don't exist; that is, they're too confident.
SLE - a strange combo of Three and Eight, with a hint of Seven. They have the mindset of the Seven, which can switch from one mode of thinking to another very easily. They have the adaptability of the Three or Seven, and many of them have the suaveness of the Three, which seems totally uncharacteristic of an Eight. However, they can play rough and tumble like an Eight, and have the obvious outwardly-directed strength and force of an Eight, as well as having the focus of a Three or Eight totally unlike a Seven.
LIE - a combination of Three, Six and Eight with a hint of One. One of the most 'in bits' types in the socion, IMO. Essentially, LIEs have the drive and often diplomacy of the Three, sometimes with the motivations of an Eight; but sometimes also with the superficial motivations of a Three (to succeed). At the same time, their doubts and worries can't really be attributed to Three or Eight, but fit rather nicely with a Six. They also have some one habits, including striving for perfection in all they do (which could alternatively be explained by the Three aspects in them).
ESI - One/Six/Eight elements. They have the moral focus and temperament of a One, with some of the behaviour of a Six seen in the LSI. In fact, much like the LSI, in that they often have the confidence and drive of an Eight. However, you'd probably expect more Ones to identify with ESI > LSI due to the whole moral thing. LSIs don't do something bad because it's not in their system; ESIs refrain from doing something bad simply because it's wrong - a way of thinking far more in line with the One mindset.
SEE - Three, Seven and Eight. Probably more suave than the SLE, and so less Eight-like, they have a social understanding and skills of a Three/Seven playboy individual which are very rare in the Eight. At the same time, they have more of the drive of an Eight, and certainly more confidence (since Eights are more confident internally than Threes or Sevens).
LSE - another 'bits of lots of types' type; a really weird combo of One, Two, Three, Eight and Nine. The Nine elements are inherent in all Deltas; probably because Si valuing is so typically a Nine thing, or perhaps vice versa. They have the striving for perfection element, the routine, the innate goodness etc. of the One, the drive of the Three (or perhaps Three and Eight combined, and the independence of the Eight. The Two comes from their being a caregiver.
SLI - a combination of Five and Nine. They have the energy of the Nine, and, again the aspects of a Nine that all Deltas have, but the emotional detachment and the Te creative of a Five.
IEE - a combination of Six and Seven, with perhaps a small dash of Nine. Like a Seven in every basic respect, but without the emotional detachment. On the contrary, the IEE acts more like a Six warming to others, although this probably stems more from a Nine's motivation of emotional harmony rather than the anxiety of the Six.
EII - a combination of One and Nine. Has the calm and serenity of a Nine, but the temperament (which is actually quite opposed to Nine) and the morality - without the preachiness (probably found more likely in an ESI) - of a One.
Any questions, feel free to ask.