If you are against a team with a lot of squishy champs, then Jhin might be a good choice. With DH he can burst a lot of squishies down very easily, but he struggles very hard against tanks and very tanky opponents. His w is pretty hard to use without your team CCing the target first (like a stun instead of trying to root a slowed or not CCed champ).
Idk how good she is with the crit update, but if you are top than Quinn might be a good choice. She is really good in melee matchups, but some melee champs like rumble fuck her up hard. Quinn’s roam power at lvl 6 is really good, so you can get a lead before lvl 6 in your lane then run around while your jungler holds top so you can quickly give your teammates a lead.