devtrackers.gg
Congratulations! Lulu was the hardest one for me, if you can tackle her you got the rest no prob. :)
Never thought I would get a Riot employee to comment on my post, but here we are! Thanks man. Honestly I just steamrolled through the early stages with lulu's support and Sumpsnipe scavenger, and with Vi having Fury and Spellshield it was really easy to level her up.
Those sound like good choices to me!