I think 25 points per character would work better simply because it's easier to deal with than half points, or at least it's easier for me to estimate how badly I think I'm doing in a current match, and outside of incredibly bad predictions negative scores really shouldn't make an entrance.

Yeah, we're definitely not going to just do 12.5-x for each character. We'll do something to keep the scores from being zero all the time.
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Tia mi aven Moridin isainde vadin
Nominate Ecco the Dolphin for Character Battle 6!