It is "impossible" to write anything from the point of view of a true Eldritch Abomination, since to be an Eldritch Abomination, the characters mind and thinking would have to be utterly incomprehensibly alien.. if there is anything the reader could understand about what the E.A: MC is thinking or why.. it would not be a true Eldritch Abomination.. any mention of what the E.A. MC is thinking would have to be in the form of something like: kjkjhdf edsfdsu hksihfwe kdfjhsfh.. and even that already have way too much human intelligible structure to it be truly the thinking of an Eldritch Abomination..
At your own risk. And maybe mine. Marunomi (you are a monster by AryaX definition). NSFW ^100 Saya no uta. The world as you see it is an abomination. I suggest this. Both are VNs. Make sure you have enough SAN points for either of them. These are what I can think of when asked about eldritch abominations. If you wanted eccentric mcs, write eccentric mcs. Edit: added some descriptions