Xantospoc said:
Conventional durability would be indeed bypassed ... for small amounts of damaged steadily regenerated.
Also, Chara was affected by it, but before then; Chara was limited to Frisks' body, the mighy Tomato knocked, which is much weaker (he can only use potency because he manifests it by bloodlust). Beerus' strength is far above a human child.
Also, none of that would matter as Beerus could eventually freeze him with a stare for an easy attack
You do realize that Healing from a minor wound like a cut or even a hole in a stomach doesn't even come close to healing from an attack that destroys your very soul, right?
Last time I checked, Beerus had no Regenerationn of the Spiritual variety. Did you forget KR? You know, the thing that's basically Soul Poisoning that becomes more potent the more people you've killed? Guess how many Beerus killed. Hint: A LOT more than Chara. Even when healing, KR keeps going on regardless if you healed fully and won't go away until the effect wears off.
About Chara:
1. Sans was attacking their SOUL, their very Being. Where all the source of their Determination came from.
2. Again, even if Chara was 1,000,000 to 1,000,000,000 times weaker when fighting Sans due to being limited by Frisk's body, would STILL make them strong enough to solo Composite Dragonball on their own. Chara's power doesn't come from physical strength, it's from their unbridled amount of Determination and Killing Intent. They're just as powerful if not more so then Frisk at max Determination, who is 2-B despite being a "Human child". You do realize just because they're human, doesn't mean they're weak, right? You're telling me Beerus is more powerful than two kids who can reset and create new timelines over and over and are Multiversal? Especially when he hasn't shown to be even strong enough to be considered High 3-A, let alone 2 and above?
3. Check their Tiers again:
Beerus- 3-A
Chara- 2-B
That's a PRETTY big gap right there. In the opposite direction of what you said. Even in Sans' profile states Chara was STILL Multiversal when fighting him and he beat them. Multiple times.
That's only if Sans allows that, and he probably won't considering he'll use very trick (teleportation and spatial manipulation) to avoid that. Beerus is usually casual and really wouldn't go all out until he finds his opponent strong enough to handle his power. Sans has no such issue there. Espically since it's stated in the OP that he'll use every trick he has to put Beerus down.
Now I'm not saying Beerus CAN'T win. He can if he realizes how much of a threat Sans is and attacks instantly, he'll win. But he has no clue who Sans is. What he can do. What his powers are. Neither does Sans know anything about Beerus, but that won't matter much due to his hax and won't affect him any differently.