Kennen & Nautilus Synergy
Kennen Top and Nautilus Support win 50.8% of 1,670 Low Elo games together, +1.2 points vs expected, 2-patch window 26.19-26.20.
Researched on LoL patch 26.20. Tips are written to hold at any rank; stats come from Low Elo ranked games up to patch 26.20.
Why this duo works
A likely reason this pairing works in low elo is that Nautilus can hold a target while Kennen reaches the fight and stacks Mark of the Storm with his area ultimate. This is a kit-based explanation; the high-elo sample goes the other way.
Playing the duo
Nautilus's crowd control can hold a target in place while Kennen enters with Lightning Rush and lands repeated abilities to trigger Mark of the Storm's stun.
How to play as Kennen
Wait for Nautilus to start the fight before using Lightning Rush and Slicing Maelstrom; his lockdown gives you time to reach the target and add storm marks.
How to play as Nautilus
Engage when Kennen has Slicing Maelstrom ready, then keep your crowd control on the same target so he can land his storm.
Sources
These notes come from r/Kennenmains, checked against the champions' abilities.