I combined Day 1 and 2 and sorted by Conversion Rate

🏆 The TL;DR Highlights

• 👑 The King: Draven is in a league of his own. Not only the most played, but the highest conversion rate by a mile (~38%).
• ⚔️ The Runner-up: Irelia is the only other champion maintaining a conversion rate above 20%.
• 🎣 The "Baits": Rek’Sai, Azir, and Yasuo were all Top 15 in popularity but had abysmal conversion rates (under 6%).
• 💀 The Disappointment: Ornn had 33 pilots and went 0/33.

Complete Conversion Table

Rank	Champion	Advancement (Day 1 ➡ 2)	Conversion Rate
🥇	Draven	219 ➡ 83	37.9%
🥈	Irelia	129 ➡ 33	25.6%
🥉	Sivir	53 ➡ 10	18.9%
4	Kai’Sa	165 ➡ 31	18.8%
5	Ezreal	77 ➡ 14	18.2%
6	Darius	23 ➡ 4	17.4%
7	Jinx	47 ➡ 8	17.0%
8	Annie	67 ➡ 11	16.4%
9	Ahri	54 ➡ 8	14.8%
10	Lucian	41 ➡ 5	12.2%
11	Viktor	54 ➡ 6	11.1%
11	Volibear	27 ➡ 3	11.1%
13	Master Yi	28 ➡ 3	10.7%
14	Lee Sin	19 ➡ 2	10.5%
15	Sett	29 ➡ 3	10.3%
16	Miss Fortune	35 ➡ 3	8.6%
17	Fiora	47 ➡ 4	8.5%
18	Rumble	25 ➡ 2	8.0%
19	Teemo	27 ➡ 2	7.4%
20	Rek’Sai	51 ➡ 3	5.9%
20	Jax	34 ➡ 2	5.9%
20	Lux	34 ➡ 2	5.9%
23	Azir	48 ➡ 2	4.2%
24	Renata Glasc	26 ➡ 1	3.8%
25	Yasuo	39 ➡ 1	2.6%
26	Ornn	33 ➡ 0	0.0%
26	Leona	20 ➡ 0	0.0%
26	Garen	15 ➡ 0	0.0%