There's a number on Lucios HUD right under the crosshair. It seems to fluctuate between 1-5.
Couple questions: What is the number? Can I influence the number changes directly? Is a higher number better?
Overwatch – What’s the Number on Lucio’s HUD?
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Best Answer
The number lets you know how many of your teammates (other than yourself) are under the effect of your AoE heal/movement buff. For example, if the number is '5', the whole team is receiving your heals/boosts. If nobody (other than you) is receiving any buffs, the number disappears.
To answer your other two questions: