Life on a small Neptunian/big super-Earth planet?

I want to create an alien life for a planet which is at about 6"“8 Earth masses. It has a thick atmosphere made of hydrogen, helium, methane and nitrogen. I want that life to evolve slowly and be quite complex, and being structured enough to become intelligent. It should not follow very strictly the natural selection (I mean, no one has to have special advantages to survive to predators or something so) and be very different to earth-like life. The planet has 3 moons and orbits an orange dwarf 5 Gy old, with a luminosity of 0.38 solar luminosities, from a distance of about 1.6 AU.

What kind of biochemistry could it be made of? How could it look like? What kind of ecosphere could it develop?

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Life on a small Neptunian/big super-Earth planet?

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