This may or may not be helpful, but what I've noticed with eaters is that they have a part which gets hit and one that regenerates it.
The block is unique in that if any of its cells get destroyed, it gets replenished.
Good eaters include eater 1 and eater 2, being able to eat a number of objects.
Here is eaters 1 and 2 eating various objects (and some failed eating, leaving behind debris):
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x = 122, y = 59, rule = B3/S23
12bo$11bo13bo15bo35bo$11b3o10bo15bo14b2o19bobo13b2o$24bo3bo11bo4bo9b2o
8bo10bobo12bobo$8b2o14b4o12b5o10b2o7bobo9b2o13bo$7bobo8b2o14b2o16b2o10b
o2bo5b2o12bo2b2o$7bo9bobo13bobo15bobo7b2o2b2o5bobo12b2o$6b2o9bo15bo17b
o8bobo9bo15bo$16b2o14b2o16b2o8bo10b2o15bo$59b2o26bo$87bo13$9bo13bo96b
o$8bo13bo23bo24bo47bobo$8b3o11b3o20bo24bo17b2o14b2o13bobo$45bo3bo20bo
4bo12b2o14b2o13b2o$3bob2o11bob2o23b4o21b5o13b2o9bob2o11bob2o$b3ob2o9b
3ob2o13bob2o21bob2o19bob2o10b3ob2o9b3ob2o$o14bo17b3ob2o19b3ob2o17b3ob
2o9bo14bo$b3ob2o9b3ob2o10bo24bo22bo16b3ob2o9b3ob2o$3bobo12bobo12b3ob2o
19b3ob2o17b3ob2o12bobo12bobo$3bobo12bobo14bobo22bobo20bobo13bobo12bob
o$4bo14bo15bobo22bobo20bobo14bo14bo$36bo24bo22bo12$10bo$9bo22bo34bo12b
o10b2o$9bo5bo15bo34bobo10bobo8bobo$9b6o16bo5bo13b2o13b2o11b2o9b2o$3b2o
26b6o13bobo8bob2o11b2o9b2o$2bobo18bob2o23b2o7b3ob2o10bobo8bobo$2bo18b
3ob2o18bob2o9bo16bo10bo$b2o17bo22b3ob2o10b3ob2o9b2o9b2o$21b3ob2o15bo18b
obo$23bobo17b3ob2o12bobo$23bobo19bobo14bo$24bo20bobo$46bo!
EDIT:
After trying to find a eater for the 'big A' spaceship, here are my best attempts:
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x = 88, y = 17, rule = B3/S23
o21bo7bo21bo12bo21bo$3o17b3o7b3o17b3o12b3o8bo8b3o$3bo7bo7bo13bo5b2ob2o
5bo18bo3b2obobob2o3bo$2b2o7bo7b2o11b2o5b2ob2o5b2o16b2o3b2obobob2o3b2o
$11bo64bo4$4b3o9b3o15b3o9b3o20b3o9b3o$4bo2bo7bo2bo15bo2bo7bo2bo20bo2b
o7bo2bo$4bo13bo15bo13bo20bo13bo$4bo13bo15bo13bo20bo13bo$5bobo2b3o2bob
o17bobo2b3o2bobo22bobo2b3o2bobo$9bo3bo25bo3bo30bo3bo$9bo3bo25bo3bo30b
o3bo$9b5o25b5o30b5o$9bo3bo25bo3bo30bo3bo!
The eaters on the sides eat the spaceships, but the big problem is that the 'A' forms a traffic light.
Is there any way to eat the traffic light?