The list is not in specific order.
1. CLSW
CLSW is the first person that I have came up in mind. He is one of the mappers in osu!catch who revolutionized and pushed the boundary of osu!catch maps forward, by creating innovative jump and stream patterns. For instance, IMAGE MATERIAL and Genryuu Kaiko. Apart from mapping really difficult maps that may crush player's fingers, he is also versatile and able to map soft and peaceful songs. One of the maps that impressed me the most would be Sayonara I Love You.
2. ExGon
Shuttling between various maps, it is not hard to find ExGon's records, especially in the hardest maps. ExGon is an all-round player who can read and play HR, DT and NoMod well. I believe everyone of you remembered his shining play in neu. He can also read a lot of strange patterns and difficulty settings, for example SS'ing CS6 map with HR in Koibumi2000. Recently, he also conquered wh with a brilliant HDHRFL SS.
3. kenji
The former champion of CtB. kenji was one of the best players in the old days, who can read high AR maps without much troubles. He played HR mostly, such as Romantic Children. He also inspired other players to push themselves to the extreme by playing HR.
4. Dusk
Being the former #1 in osu!catch, Dusk showcased his talents in playing seemingly impossible maps. In the old days, he FC'ed plenty of maps with HT, for instance Don't say "lazy". He also play FL at that time, such as smooooch, showing his full grasp in reading. In the previous year, he conquered a lot of maps and Overdoses with DT (or NC as he prefers so). His splendid play on Akatsuki no Tsuki will etch in our hearts forever.
5. [224]Hyperw7
Looking at his list of replays, it is not surprising to see him playing HR all the time. Being a HR specialist, Hyperw7 is capable of FC'ing every maps with HR/HDHR, even though they seemed impossible. Examples are IMAGE MATERIAL and dreamless wanderer. Despite being one of the best players in HR, Hyperw7 put a lot of efforts on improving his skills. In the bygone days, he spent over 9000 playcounts on FC'ing Calamity Fortune with HR. His strength is definitely over 9000!
6. VelperK
Formerly the god in CtB, VelperK was a versatile player who can play all mods. For HD, he can read strange patterns without troubles, for example The Big Black. For HR and DT, he is also good at these mods, like Can't Defeat Airman and William Tell Overture.
7. Habin
While some of you may be unfamiliar about Habin, he is a FL lover, and he keeps on bettering his FL reading by practising tons of difficult maps and osu!catch maps. You may find his whopping records in Adularescence and XENO, proving his worthiness in reading notes with FL.
8. Spectator
A veteran player, mapper and former staff member. Spectator is able to make maps with outstanding flows and patterns, you may take a look at EOS (kamome sano rmx) and Mousou Express. Besides from mapping, he is also a great all-round player. He is capable of HR, DT and HD. Some of his amazing replays are: Genryuu Kaiko - FC with HDHR ; L'avide - FC with HDDT and Hades in the Heaven - FC with HDHR. These maps are not really easy to beat on.
9. andysun
One of the experts in the good ole' times. andysun played quite a lot of maps and showcased his strength in spinning. His spins were not beatable by most of the players at that time, for example VOiCE. He inspired CtB players to keep on improving the spinning skills. I am also one of them.
10. YounaZheng
YounaZheng was a star in the old times. He conquered a whole lot of maps and gained over 500 top ranks, which showed his power in playing every mods and spinning. Although most of the top ranks are Easy, Normal or Hard difficulties, YounaZheng was also able to play plenty Platters and hard maps with DT after a long break.
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Honorable mentions:
_Asriel, Motion, Keine, mjj741, DreStar, HineX
1. CLSW
CLSW is the first person that I have came up in mind. He is one of the mappers in osu!catch who revolutionized and pushed the boundary of osu!catch maps forward, by creating innovative jump and stream patterns. For instance, IMAGE MATERIAL and Genryuu Kaiko. Apart from mapping really difficult maps that may crush player's fingers, he is also versatile and able to map soft and peaceful songs. One of the maps that impressed me the most would be Sayonara I Love You.
2. ExGon
Shuttling between various maps, it is not hard to find ExGon's records, especially in the hardest maps. ExGon is an all-round player who can read and play HR, DT and NoMod well. I believe everyone of you remembered his shining play in neu. He can also read a lot of strange patterns and difficulty settings, for example SS'ing CS6 map with HR in Koibumi2000. Recently, he also conquered wh with a brilliant HDHRFL SS.
3. kenji
The former champion of CtB. kenji was one of the best players in the old days, who can read high AR maps without much troubles. He played HR mostly, such as Romantic Children. He also inspired other players to push themselves to the extreme by playing HR.
4. Dusk
Being the former #1 in osu!catch, Dusk showcased his talents in playing seemingly impossible maps. In the old days, he FC'ed plenty of maps with HT, for instance Don't say "lazy". He also play FL at that time, such as smooooch, showing his full grasp in reading. In the previous year, he conquered a lot of maps and Overdoses with DT (or NC as he prefers so). His splendid play on Akatsuki no Tsuki will etch in our hearts forever.
5. [224]Hyperw7
Looking at his list of replays, it is not surprising to see him playing HR all the time. Being a HR specialist, Hyperw7 is capable of FC'ing every maps with HR/HDHR, even though they seemed impossible. Examples are IMAGE MATERIAL and dreamless wanderer. Despite being one of the best players in HR, Hyperw7 put a lot of efforts on improving his skills. In the bygone days, he spent over 9000 playcounts on FC'ing Calamity Fortune with HR. His strength is definitely over 9000!
6. VelperK
Formerly the god in CtB, VelperK was a versatile player who can play all mods. For HD, he can read strange patterns without troubles, for example The Big Black. For HR and DT, he is also good at these mods, like Can't Defeat Airman and William Tell Overture.
7. Habin
While some of you may be unfamiliar about Habin, he is a FL lover, and he keeps on bettering his FL reading by practising tons of difficult maps and osu!catch maps. You may find his whopping records in Adularescence and XENO, proving his worthiness in reading notes with FL.
8. Spectator
A veteran player, mapper and former staff member. Spectator is able to make maps with outstanding flows and patterns, you may take a look at EOS (kamome sano rmx) and Mousou Express. Besides from mapping, he is also a great all-round player. He is capable of HR, DT and HD. Some of his amazing replays are: Genryuu Kaiko - FC with HDHR ; L'avide - FC with HDDT and Hades in the Heaven - FC with HDHR. These maps are not really easy to beat on.
9. andysun
One of the experts in the good ole' times. andysun played quite a lot of maps and showcased his strength in spinning. His spins were not beatable by most of the players at that time, for example VOiCE. He inspired CtB players to keep on improving the spinning skills. I am also one of them.
10. YounaZheng
YounaZheng was a star in the old times. He conquered a whole lot of maps and gained over 500 top ranks, which showed his power in playing every mods and spinning. Although most of the top ranks are Easy, Normal or Hard difficulties, YounaZheng was also able to play plenty Platters and hard maps with DT after a long break.
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Honorable mentions:
_Asriel, Motion, Keine, mjj741, DreStar, HineX