If you see a champion it will have either:
- A small yellow crown indicating it is Tier 1
- A medium orange crown indicating it is Tier 2
- A large red crown indicating it is a Tier 3
Then, if you mouse over the champion or target it it will display it's title as one of the Champion types/themes listed above which will determine the buffs it has.
In the example you listed the "Light Bearer" Champ will have either:
Tier 1:
- Small yellow crown icon indicating it is tier 1
- Basic Champion Damage Buff
- True Sight
- Unyielding Sovereignty at half health
- Negative Vulnerability
OR
Tier 2:
- Medium orange crown icon indicating it is Tier 2
- Basic Champion Damage Buff
- True Sight
- Unyielding Sovereignty at half health
- Negative Vulnerability
- Death Block