Ugh. The idea of "tier lists" makes me gag on sight. (I've spent too much time in the Meltan community.) But I'm also one for YAY! DISCUSSION! so I'm going to post this:

And now, to
hack it to pieces with help from a friend's analysis.
This is that stupid chart from /jp/ that started this whole thing. It's an aggregate of
every match done on the ranked server there-- ie: including garbage players.
Suwako is hard to use. I WONDER WHY SHE'S LOW
So basically that entire chart is completely worthless. It's like an ease of use chart. It has no relevance on character balance. Give it some time, wait for them to come up with a chart that includes only the top such-and-such % of players.
This happened with SWR too, by the way. Reisen was trash tier for the first few months, then people started figuring the game out and she jumped three tiers - but only on the charts that included the top 30% of players. She still stunk for the global chart.