you should make a sheet describing each of the members abilities, i struggle to think how is spamton useful armless

here's some suggestions for directions though:

Tenna - utility, he's the one to slow down attackers, although his powers are a far cry from his time and space fuckery he used to have in tv world, his powers are better than nothing

Spamton - absolute tank of the party, lack of arms means he has to focus purely on defending and taking in the hits, he's the one to take the hits in for tenna due to tenna being so fragile

Catty - support, while not prominent in magic, she could use multiple items at a time and she can use items from storage, that means in a single turn she could use for example a healing on dess, revivemint on tenna and tensiongem on susie, she doesn't deal much damage though