3. Bo Dallas

Bo Dallas is one of those superstars that the WWE seems to be willing to persevere with. After a strong run as NXT Champion, Bo was brought into the main roster during the 2013 Royal Rumble match, lasting over 20 minutes and eliminating then Intercontinental Champion, Wade Barrett.
Fans of NXT gave Dallas a strong welcome, and it appeared for a time that he was going to receive an early push and maybe even an IC title shot. For one reason or another, this all changed, and Dallas was kept off the main roster for quite some time.
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His second opportunity came when he officially made his debut on RAW under a brand new gimmick. Bo was essentially turned into a motivational speaker, telling everyone on the roster to 'Bo-leive' in themselves.
The gimmick shouldn't have worked on paper, but after a small winning streak where Bo would pick up unlikely wins and do a victory lap around the ring, fans were beginning to warm to him again. For some unknown reason, the rug was pulled from under his feet yet again, losing to R-Truth and ending any momentum he had built for himself.
Both of these examples show that Dallas can connect with the fans, and most of us look back with fond memories to his time as NXT Champion, meaning he can hold a title and make it meaningful. He also has a strong heritage behind him, being the son of WWE legend IRS (Mike Rotunda).
In terms of how he measures up to current WWE Champion, Jinder Mahal, he certainly has better mic skills than the modern day Maharaja and would at least better be able to fill that role of cowardly heel champion where he finds little ways to retain his belt.
A championship reign could even lead to a brother vs. brother feud with Bray Wyatt, somebody who has held that same championship before.