Before declaring a champion healthy/unhealthy, ask yourself these questions...
Too many people confuse design health with balance. For example, a totally broken champion in terms of balance who is OP as hell, but can be brought in line through tuning some cooldowns or stats, is not unhealthy, they are just overtuned. And of course it goes the other way as well. So I looked over Riot's posts regarding unhealthy/healthy champions over the years and these are the questions I feel you should ask yourself before stating a champion is healthy/unhealthy. Of course, these questions only work if you are willing to be UNBIASED and OPEN MINDED in your answers.
01: Does this champion's kit allow for enemies to defeat them through having more skill, strategy and build knowledge? Yes? +1 for Healthy, no? -1 for unhealthy.
02: Does this champion's kit allow them to defeat enemies though having more skill, strategy and build knowledge? Yes? +1 for Healthy, no? -1 for unhealthy.
03: Can this champion's kit stay at a mostly neutral balance point through minor number/mechanic tuning by Riot? Yes? +1 for Healthy, no? -1 for unhealthy.
04: Is this champion's kit/playstyle entirely defeated by a single item/stat that enemies can easily acquire? No? +1 for Healthy, yes? -1 for unhealthy.
05: Is this champion rewarded for being ahead but still able to lose through mistakes or superior enemy play? Yes? +1 for Healthy, no? -1 for unhealthy.
06: Is this champion punished for being behind but still able to recover through enemy mistakes or superior play? Yes? +1 for Healthy, no? -1 for unhealthy.
07: Does this champion have more than one linear strategy/option for team fighting and defeating enemies? Yes? +1 for Healthy, no? -1 for unhealthy.
08: Does this champion have more than one linear strategy/option for enemies to defeat them in team fights and skirmishes? Yes? +1 for Healthy, no? -1 for unhealthy.
09: Does this champion's kit allow for them to interact with enemies and be interacted with by enemies during laning phase, teamfights and skirmishes? Yes? +1 for Healthy, no? -1 for unhealthy.
10: Does this champion succeed at fulfilling player fantasy to a reasonable extent regarding their lore, thematic and intended gameplay style? Yes? +1 for Healthy, no? -1 for unhealthy.
11: Does this champion's base kit design crowd out most other options for the same class/role regardless of tuning? No? +1 for Healthy, yes? -1 for unhealthy.
If a champion is scoring +1 on a most/all of these, like it or not they are likely a healthy design and can be brought in line through tuning in the forms of minor buffs, nerfs or adjustments.
If a champion is scoring -1 on a most/all of these, like it or not they are likely an unhealthy design and need large adjustments to their kit or a possible rework.
<- This guy doesn't like this list.

