Gangplank vs Ornn Top Matchup
Gangplank Top wins 46.8% of 1,078 Low Elo games against Ornn Top, -0.7 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.
How to play as Gangplank
Farm and avoid Ornn's Volcanic Rupture(Q)-Searing Charge(E) engage; Gangplank players describe this as a low-kill lane where scaling is safer than forcing trades.
Trade after Ornn has used Bellows Breath(W), and avoid walking into its Brittle proc; Gangplank mains specifically recommend waiting for Ornn's W cooldown.
Ornn can create a pillar with Volcanic Rupture(Q) and turn it into an E knockup, while Gangplank's Powder Keg(E) gives him a ranged barrel threat around the wave.
How to play as Ornn
Punish Gangplank when he overextends to farm, but avoid chasing too far down the lane; Gangplank players say Ornn can punish overextension while this is otherwise a low-kill matchup. (Unverified: no source confirms this note.)
Sources
These notes come from r/gangplankmains, checked against the champions' abilities.